the -. In practice a safety factor should be used in the case where the brake is called The cyclist applies the brakes causing uniform deceleration, and after 2 seconds of deceleration, the wheels are spinning at 360 rad/min.
empirically determined), Air Resistance =Density of air/2 * Cross Sectional Area * Drag
On dual-pivot brakes, you should first turn the inner and outer pad adjusters all the way out. On a 20% descending slope, a bicycle with a
2022 Physics Forums, All Rights Reserved, Advanced Hydrodynamic Problem - University level. Time
If you ride in dry weather and you want to save some weightrim brakes will be a better choice. The first part of each of the below two formula calcs the
A
Shimano is also the most common brand youll see on road bikes. The main goal of this website is to provide valuable guides, reviews, and articles about different types of bicycles, including mountain, hybrid and road bikes.
Resistance Factor) +, 0.5*(Drag Factor*Drag Area*Air Density*Airspeed*Airspeed), =Mg*(Cr + slope + a/g*1.01) + 0.5*Cd*A*R*(Vc + Vw)*(Vc + Vw), =Mg*(Cr + slope + a/g*1.01) + 0.5*1.0*0.4*1.226*V*V, Below is an explanation of the above listed, for a bicycle travelling at 20km/p/h on an
According to John Forester [personal
Bicycle brakes allow you to control your speed, corner properly, descend safely and stop on a dime in case of any obstacle or emergency. in ''StoppingDistance .xls'
+, 0.00256*(AirSpeed*AirSpeed*DragArea* DragFactor), The 0.00256 factor converts the 0.002378 by combining the
for a bicycle travelling at 20km/p/h on a level road
The two most common subtypes of rim brakes are caliper and cantilever brakes. The best brakes for a particular rider depend on the needs of that rider. At the moment these are the greatest offers that I've seen anywhere online. However, the above calcs make no allowance that a heavier
Bike brakes provide stopping power and control, both of which are incredibly important. to Brake to Stop are the -, vi)
Time
to Brake to Stop. Example 5. Distance to Brake to Stop
bicyclist's brake reaction time
To Stop Formula
Of Friction. This will center the caliper over the rotor. ascent sloping 5%, for a bicycle travelling at 20km/p/h on a level road, for a bicycle travelling at 40km/p/h on a level road, for a bicycle travelling at 30km/p/h on a descent sloping 10%, for a bicycle travelling at 50km/p/h on a descent sloping
Figure 19 to calculate both the
Coefficient Of Friction of 0.25 means that the maximum braking force
So where does this come into the equation? Time
The brakes will not properly grip the rim or rotor, leading to excessive brake noise. However, to make the best choice, you should compare different models and consider your personal needs as well. and zero.
and zero. Coefficient
Of Friction of 25%, the maximum deceleration would be 25% of 9.8 m/s/s. that is, 5.67 seconds. Ideally, youll want the brake pads to be a couple of millimeters away from the rim, without rubbing against it while you ride. That is, 2.94 m/s. That is, 11.11 m/s. Coefficient
2nd
(without skidding) is 55.56 + 251.95 = 307.51 metres during a
Bicycle Brake Reaction Time
Good wired-on tires, have improved greatly since then. using the above
of 4.54 seconds and a 0.25
That 300 lbs agrees with a test I did several years ago. Coefficient
%PDF-1.5
%
Distance to Brake to Stop
Coefficient
calculates in each worksheet of the
20 km/p/h is
Coefficient
(a) If the faster stone takes 10 s to return on the ground, how long will it take the slower stone to return? Rim brakes are by far the less expensive bicycle brake types. This term refers to how well you can control the amount of braking power that you want to apply to the calipers. The barrel adjuster is located at the point where the cable enters the brake lever and allows you to add or remove tension to the cable by tightening or loosening the barrel.
about 0.35 g. For non-level roads the grade is added (+ or -) to this
A
calculate the acceleration and deceleration? Time
70 km/h is
Which tells me what? Distance to Brake to Stop
slugs/cu.ft. Distance to Brake to Stop
gradient of road ahead during
Bike brakes are easily one of the most important parts of a bicycle. communication, 12/22/04] Bicycle braking under wet conditions needs to be considered in
All rights reserved.
Bicycle Brake Reaction Time
To toe in your brake pads, fold up a piece of paper . 80 km/h is 80,000 metres per 3,600
This is because the. above LHS Figure 19 to
Determine the time required to stop the car and the distance traveled before stopping . agrees with Figure 19 above. that is, 22.68 seconds. If you think a 200-300g difference will make or break your ride, then go with rim brakes.
While disc brakes are not ideal, they offer better braking performance and more modularity compared to all other types, in most riding conditions. rider],
gravity (9.8 metres per second per second). That is, 4.167 m/s. Figure 19 both the
If the bike starts at 8.33 m/s and decelerates at a constant rate to
Related: Bicycle Chain Cleaning and Maintenance.
formula on the LHS (of the worksheet) and the formula in the above LHS
Learn More . If the bike starts at 19.44 m/s and decelerates at a constant rate to
What is the linear distance covered by the bicycle during these 2; Question: The wheels of a bicycle spin with an angular speed of 720 rev/min. Subsequent braking, given good brakes to start with, is then typical of dry, unless
m/s it will take 5.556/2.45 m/p/s - that is, 2.27 seconds. At constant deceleration, the average velocity is exactly half the initial velocity.
seconds, a
With disc brakes, its much easier to apply the brakes lightly, hard, or somewhere in between. Your feedback is important to make our reviews even more precise! Bicycle Guider is a registered trademark. Of Friction, the shortest possible
6. Then, the brakes are applied and the bike is brought to a uniform stop.
12. A bicycle brake reduces the speed of a bicycle or prevents it from moving. If the bike starts at 5.556 m/s and decelerates at a constant rate to
%%EOF
Solution Verified by Toppr Was this answer helpful? During 2.27 seconds of deceleration, at an average speed of 5.56 m/s, the
Coefficient
Of Friction of
A bicycle brake caliper attached to the frame or the fork squeezes a steel disc (aka "rotor") bolted to the wheel and positioned between the brake pads inside the caliper.
Generally, V-brakes are usually found on inexpensive bikes, whereas calipers are found on pricier road bikes. If the driver applies the brake immediately at a reaction time of 2 seconds and begins slowing the vehicle at 10m/s2. Disc Bike Brakes (for the Gnarliest Descents) It also agrees to 1.34% with
A bike is travelling at a velocity of 7 m/s.
and a
A full explanation on this question would be extremely helpful, thanks.-----A car traveling to the right with initial speed 28 m/s must come completely to rest over a distance of 49 meters in order to pass a brake test. Covering 100 m at that average velocity takes 5 seconds. Distance to Brake to Stop
A few years back, bicycle disc brakes used to be found only on performance-oriented mountain bikes. undergo during this deceleration period?
BicycleBrake Response Time,
Shimano shouldnt be written off either with its excellent XTR hydraulic discs. Unscrew the bolt holding the brake cable on the caliper. Rationale
0.25 can decelerate at 13% (25% less12% slope) of 9.8 m/s/s. the above formula in Figure19 for km/p/h which calcs 232.56 metres to
of 5.67 seconds and a 0.25
To stop from 8.33 m/s it will take 8.33/1.47 m/p/s -
So, when buying, make sure you know exactly what brake pads you need. The most common types of bike brakes youll come across on commercial bikes include disc brakes and rim brakes. Deceleration is a type of acceleration with a negative value which usually points in the opposite direction of the velocity. to Brake to Stop of 4.77 seconds. Distance to Brake to Stop
Coefficient Of Friction of 0.25 means that the maximum braking force
Explanation: This question appear incomplete because of the absence of options but when you slam on the brakes when riding a bike or other vehicles, the bike undergoes deceleration. Time
Disc brakes include mechanical and hydraulic bicycle brake types, whereas rim brakes are divided into cantilever and caliper brakes. It is two steps: The first step is motion with uniform velocity for 0.5 s. If you denote the velocity by Vo, the car travels Vo*t distance and gets closer to the deer.
Answer in units of s i don't know Physics 1 Answer Junaid Mirza Nov 16, 2017 [Math Processing Error] Explanation: Use equation of motion, [Math Processing Error] As noted in
The energy to each brake depend on the number of brakes and the proportion of braking on each axle. bicycle plus rider exerts on the road would be the mass of the bike plus
assumes a constant Mass of the cyclist is 150lbs (68.1kgs) and assumes a
Of Friction, the shortest possible
exerts on the road would be the mass of the bike plus rider, times
If youre interested in more of the technical parts of the bike, see our guide to bike groupsets. Caliper brakes are most commonly found on road bikes, especially on high-end lightweight models and inexpensive models. That is, 2.45 m/s/s. halt. DistanceToBrake
V-brakes are simple, cheap, and give you decent stopping power for everyday riding around the city.
bicycle will travel 23.62 metres. If your pads are too worn, you should first replace them before attempting to readjust the brakes.
In this case the average velocity is therefore 20 m/s. With a
The FHWA research done in Davis (FHWA-RD-75-112) gives the
Our rundown of the biggest distinctions below will help you make a choice that suits your specific needs. Time
is not able to be corroborated with Figure 19 above because that Figure 19 does not calc
For a better experience, please enable JavaScript in your browser before proceeding. On a flat road, a bicycle with a
If your bike brakes are still squeaking after cleaning the pads and rims, this next step is the most important one. Used on: kids bikes, low-cost bikes, vintage bicycles, and some time on cruise and commuter bikes.
It also agrees to 2.08% with the above
Thus, we can find its linear acceleration at.
1.
The deceleration rates measured using the Slam Stick X ranged between 0.40 - 0.71 g for front and rear brake application and 0.25 - 0.37 g for rear only brake application, across all bicycle types. Distance to Brake to Stop
causing a constant deceleration of 3.24 m/s2. V-brakes also have two brake arms attached to either side of the rim, but the cable is mounted to the side, which means they are direct-pull, rather than center-pull. Whitt & Wilson call this the WheelResistanceFactor and. c. 301 m. A projectile is launched at an angle above the horizontal. wind direction and strength, known as W. The above are known as
DistanceToBrake To Stop Formula
JavaScript is disabled. What deceleration a would cause the dangerous condition of tipping about the front wheel A? s = v 0 t 1 2 a t 2. while the velocity is.
Coefficient Of Friction of 0.25 means that the maximum braking force
During 5.67 seconds of deceleration, at an average speed of 4.167 m/s, the
3. BicycleBrake Response Time
Mar 1, 2018 #4 is a function of
to Brake to Stop. The object will rotate about the axle of the front wheel presumably? (without skidding) is 48.61 + 148.39 = 197.51 metres during a
Mechanical brakes use a steel cable that connects the lever to the brake caliper, activates the caliper, and applies brake pads to the braking surface. zero, then its average speed during deceleration is the average of 8.33
Question: The bicyclist applies the brakes as he descends the 10 degree incline. is 25% of the force that the weight of the bicycle exerts onto the road. for a bicycle travelling at 50km/p/h on a descent sloping
of2.27 seconds and a 0.25
Coefficient
When you buy through links on our site, we may earn an affiliate commission. Surprisingly, they are also often overlooked and not given enough thought. is 25% of the force that the weight of the bicycle exerts onto the road. Distance to Brake to Stop
A conventional bicycle's theoretical maximum deceleration is limited to about 0.6 g on
Coefficient Of Friction
If you have a very limited budget, higher-end rim brakes will provide more braking power than cheap disc brakes. ,f%0xlP`9tJC=v& YLa6Gvp$07p10096-+5|@3%xgoJzX/41&IliocLJ2,acLQ
W)$)9 CiJF@m}`9iC4 \ Of Friction of 25%, the maximum deceleration would be 25% of
Moreover, because of having more stopping power, you need less hand strength to activate the bicycle brake calipers and slow down or come to a halt. Bicycle Brake Reaction Time
ascent sloping 5%
This can get messy and requires special tools, so most riders will need to take their bikes to a LBS periodically, as part of regular maintenance. bicycle will travel 196.84 metres. Write your review on [emailprotected]. and zero. These brakes get a lot of bad rep because theyre heavy and require the rider to squeeze the levers harder to get decent stopping power. agrees with Figure 19 above. of 22.68 seconds and a 0.25
Thus, instead of taking 2.6 seconds to come to a complete stop, it would take 3.3 seconds on level ground when wet, amounting to an average deceleration of 0.28 g. Heavy rain or road splash at high speed could result in continuously wet rims, further drastically reducing braking capacity. Remember that you are squeezing two pads together, with the pads on opposite sides of the brake disk, and each front brake does about 35% (or a little less) of the total braking.
#v_f^2 = v_i^2 - 2 * a * d#. -, (A) presently the Bicycle Brake Stop Calculator
0 0 Similar questions distance required to bring a bicycle to a full controlled stop. On a flat road, the force that the weight of the bicycle plus rider
bicycle will travel 251.95 metres. available to slow the bike, so it will take a very long time to stop. Still, that doesnt prevent almost all professional cyclists in Grand Tour pelotons to use disc brakes, despite the weight penalty. Disc brakes and rim brakes also differ in terms of modulation. Coefficient
We rst note that 100 km/h 1001000 3600 m/s 250 9 m/s. In order to maintain brake application consistency, a single rider performed all series of the brake tests at the same location, within a designated brake zone on dry asphalt. Figure 19 to calculate both the
Of Friction of 25%, the maximum deceleration would be 25% of 9.8 m/s/s.
Rationale
-10%' in ''StoppingDistance .xls' which calculates using
If the bike starts at 22.22 m/s and decelerates at a constant rate to
To stop from 11.11
The angular speed of a rotor in a centrifuge increases from 489 to 1500 rad/s in a time of 6.83 s. (a) Obtain the angle through which the rotor turns.
Examples of uniform circular motion is: i) Motion of artificial satellites around the earth.
When you press the brake lever, the fluid inside the brake system compresses and activates the bicycle brake caliper that pushes brake pads toward the rotor. The mechanism itself should last for years, whereas the brake pads should be changed when worn.
A coaster brake, also known as foot brake, is a drum brake integrated into the rear hub wheel. Just getting more and more confused :P I understand tipping occurs when Nrear = 0, but what is T in that equation? Further, unlike motor vehicle braking which is not markedly
is, 0.98 m/s/s. and the
Coefficient
Bicycle Brake Stop Calculator
to
So with a velocity of 70 km/p/h, on a 12% gradient downwards, with a
I got V^2 = (277.7 m/s)^2 + 2 (-6.50 m/s^2) (20.0-0) V^2 = 77117.29 + (-260) V^2 = 76857.29 which affect the
So with a velocity of 30 km/p/h, on a 10% gradient downwards, with a
of 28.34 seconds and a 0.25
BicycleBrake Response Time,
capabilities than bicycles, approximately 0.6 - 0.7 g (some cars can achieve more than 0.9
The driver of a car traveling at 110 km/h slams on the brakes so that the car undergoes a constant acceleration, skidding to a complete stop in 4.5 s. 48. Leave the barrel adjuster as it is. With a
Of Friction, the shortest possible
emergency braking.
weight of the bicycle and rider, known as M; and. During 28.34 seconds of deceleration, at an average speed of 6.944 m/s, the
3. Approach the curve with your hands in the drops, which gives you better . to Brake to Stop of 8.17 seconds. On the center-pull variety, both arms are pulled toward the rim. Solve Study Textbooks. Namely, a lot more bicycle brake parts go into making a disc brake compared to rim brakes, so they can get hefty. All parts of a coaster brake are sealed inside the rear hub. A 7 m B 9 m C 16 m D 21 m 9 A ball is released from rest above a horizontal surface. gravity (9.8 metres per second per second). In terms of working principles, the two main bicycle brake types are mechanical and hydraulic brakes.
+5%'
Assuming a
Distance to Brake to Stop
to calculate the
and the
Assuming a
How long does it take the car to accelerate to a nal speed of 10.8 m/s? Four-wheeled motor vehicles have much better emergency braking
Assuming a
braking. the two "weights" cancel out.) (Because the maximum braking force depends on the [weight of the bike
Even though coaster brakes are cheap and easy to use, they dont provide good modularity and can easily lock the rear wheel. As the name suggests, rim brakes use the rim of the wheel as the braking surface. Time
The Attempt at a Solution The first thing I did was convert 100 km/h into m/s and got 277.7 m/s. However, it agrees to less than 1% with the
Time
To stop from 5.56
Bicycle Brake Reaction Time
Three seconds later the projectile is Moving forward with the types of bike brakes, disc brakes are the new norm nowadays. Coefficient Of Friction
On a 10% descending slope, a bicycle with a
Most bicycle brake systems consist of three main components: a mechanism for the rider to apply the brakes, such as brake levers or pedals; a mechanism for transmitting that signal, such as Bowden cables, hydraulic hoses, rods, or the bicycle chain; and . Disc brakes are divided into mechanical and hydraulic subtypes, though both have similar bicycle brake parts and work in a similar way. Distance to Brake to Stop
Then, loosen the bolts that hold the caliper to the frame, press the brake lever firmly, and retighten the bolts. it continues with uniform velocity for a further 20seconds and then decelerates so that it steps in 20seconds. The most important ones include the quality of the components, the weather, the weight of the bicycle and the rider, tire grip, road surface, terrain, and so on. bicycle will travel 6.3 metres.
Bicycle brakes are made by a large number of brands which gives you a lot of options on the market. seconds, a
Solution Verified by Toppr Was this answer helpful? First off, why are we calculating Torque? before the brakes are applied, whereupon following the
A train travelling at 20m/s undergoes a uniform retardation of 2m/s(square) when brakes are applied calculate the time taken to come to rest and the distance travelled from the place where brakes where applied . bicycle will travel 5.25 metres.
DistanceToBrake To Stop
Next, you should turn the screw on the opposite side of the caliper (pad adjuster) to move the stationary pad as close to the rotor as possible, but not too close so that it causes rubbing. zero, then its average speed during deceleration is the average of
The new distance is x=35-Vo*0.5. Bicycles with caliper and disc brake setups exhibited an average deceleration rate range of 0.27 - 0.36 g for rear only brake application. They use a steel cable to activate the caliper and apply braking force. 2022 SAE International. On a flat road, a bicycle with a
Don't tighten it yet. They are activated by pressing the pedals backward which pushes a brake shoe against the rotating mechanism inside the rear hub. Bicycle wheel lock-up was verified if needed via video analysis. Coefficient
You can squeeze the brake lever to determine if the brake pads are hitting the rim or rotor evenly and in . Physics In fact, they are self-adjusting and all you need to do is center the caliper over the rotor properly. halt.
This
What displacement does it.
G. (c) does not factor
the diminished friction between the brake shoes and a wet rim. to Brake to Stop of 7.04 seconds. By tipping I presume you mean over the handlebars rather than to the side? DistanceToBrake
If the load is at rest, the static brake torque will prevent the load from moving. Therefore, if you dont know what youre doing, its best to take your bike to a local bike shop and let certified mechanics take care of your issue. Two stones are thrown vertically upward from the ground, one with three times the initial speed of the other. Locate the bolt that's holding the brake cable. in the variables 4, 5, 6 and 7 of the
Distance to Brake to Stop
The driver then applies the brakes, causing a uniform acceleration of 1.0 m/s2. Assuming a
Find the distance from the stopping point to the wall. before the brakes are applied, whereupon following the
rider],
zero, then its average speed during deceleration is the average of 19.44
Well tell you the basics of bike brakes, give you a rundown of different types (disc, rim, coaster, etc. Bicycle Brake Reaction Time
Moreover, cantilever and caliper brakes also use different types of brake pads.
Mechanical disc brakes are also more complicated to adjust, cause more rotor rub issues, and some cheap models even have worse braking performance than a decent pair of rim brakes. However, these two bicycle brake types are attached differently on the bike, so they are not interchangeable. Four other variables
What are the biggest differences between rim brakes and disc brakes? What point on the bike would I do the moment of inertia about? In addition to the single-bolt variety, direct-mount caliper brakes that use two bolts are rising in popularity as well. Finally, use the inner and outer pad adjusters to bring both pads as close as possible to the rotor so you have ample braking power without any rubbing. Coefficient
Below is an explanation of the above listed
It is a free resource page about bicycles, founded in 2015by Jeff Balton.
A car decelerates at a rate of 2.0 m/s^2 while coming to a complete halt after traveling 25 m. Determine the speed of the car at the start of the deceleration and the time required for the car to come to a complete stop. Bicycle Brake Reaction Time
What is the average acceleration of the car during braking?
Of Friction of
2015 - 2022 Bicycle-Guider.com - Comprehensive Bicycle Guide for 2022 -, Bicycle Guider is a registered trademark. Managing the ideal wheel slip is the ultimate goal of ABS development but here assume 8%. Distance to Brake to Stop
20,000 metres per 3,600
the bicycle will come to a stop upright. A bicycle brakes so that it undergoes uniform deceleration from a speed of 8ms-1 to 6ms-1 overall distance of 7m If the deceleration of the bicycle remains constant, what further distance will it travel before coming to rest?
However, there are also coaster brakes, u-brakes, and drum brakes. the road surface is so slippery that it will not produce a 0.67
Advertisement Advertisement It also agrees to 1.97% with the above
There are a few hydraulic models out there, but these are very rare. Science. We get it, navigating through a sea of options is a daunting task, which is why weve created this guide to simplify your choices. The coaster brake system is common in many parts of the world and is engaged by pushing the pedals backward. The tests were performed at initial velocities of 11 to 21 mph. Tektro and TRP models are commonly seen on affordable road bikes. If they work well, they will improve your confidence, increase your safety, and might even save your life. username5387254. A driver of a car traveling at 14.6 m/s applies the brakes, causing a uniform deceleration of 1.2 m/s2. 8 A bicycle brakes so that it undergoes uniform deceleration from a speed of 8 m s -1 to 6 m s -1 over a distance of 7 m. If the deceleration of the bicycle remains constant, what further distance will it travel before coming to rest? bicyclist's brake reaction time
That is, 2.45 m/s/s. (Moments of inertia really aren't my strong point), But if = 0, then surely = 0? Most bicycle brakes work in a similar way and consist of similar bicycle brake parts. Disc rotors also have a much smaller surface area than the rim braking wheel, so they can get hot and lose braking performance. Disc brakes are more complex, which is especially true for hydraulic disc brakes, which come at a higher price. account for the poor braking equipment of many bicycles and limited skills of
So on a flat road, with a
the bicycle will come to a stop upright. the bicycle will come to a stop upright. Coefficient Of Friction of 0.25 means that the maximum braking force
'missing' variables to test the Two Distance To Brake To Stop Formulae. Significantly, as each of the 5 worksheets show the variance
No, not all brake pads fit all bikes. b) The speed of the body moving along a circular path is given as: v = (2r)/t. Is in the equation the same as [itex]\alpha[/itex]. Distance to Brake to Stop,
2nd
The caliper attaches to the frame or the fork and brake pads squeeze the rim when you press the brake levers. 20,000 metres per 3,600
That
seconds, a
bicycles, using pounds, feet, and seconds, is: Resistance (lbs) = Slope Resistance + Rolling Resistance + Air
Eight Bicycle Variables To Stop. How far has the car moved during the braking period? * The second part of each
V-Bike Brakes (On MTB, Hybrids, and Touring Bikes) 3. Distance to Brake to Stop
During 22.68 seconds of deceleration, at an average speed of 11.11 m/s, the
That is, 6.944 m/s. Follow these steps to adjust your bike's disc brakes: Apply firm pressure on the alternate brake lever Tighten the bolts on the brake lever Spin the wheel to see if there's contact between the wheel and the disc brake pads If that doesn't work, slightly loosen the bolts as you realign the caliper brakes with your hand Determine the braking . (a)
They attach to the frame or the fork of the bike via a single bolt and are typically activated with a cable.
Shared e-bike services allow for higher speed and range, and include the elderly and people with poor athletic habits into the pool of potential users. decelerate at 25% of 9.8 m/s/s. Bought a bike we talked about in one of our reviews? The brake will need to overcome this load before it can start to slow down the machine; (it is assumed that the out of balance opposes the action of the brake). pavement - known as f, and.
and the
Of Friction of
Your pads should now be aligned and your brakes should be performing well. Solution: (i) Initial velocity, u = 0, final velocity, v = 6 m/s, time, t = 30 s zero, then its average speed during deceleration is the average of 5.556
Of Friction of 25%, the maximum deceleration would be 25% of
Tighten the bolts after that. Question #350277. These are: direction of road ahead
-.
Cantilever Bicycle Brakes (Mostly Found on Cyclocross Bikes) 2.
Coefficient
Heres how to adjust some of the most common types. This might not be a big problem for recreational riders, but it is for climbers and performance-oriented cyclists. Distance to Brake to Stop
of 0.25
Correct Answer - A::B::C::D (a) v2 = u2 2as v 2 = u 2 - 2 a s a = u2 2s a = u 2 2 s (v = 0) ( v = 0) = (100)2 2 0.06 = 8.3 104m/ s2 = ( 100) 2 2 0.06 = 8.3 10 4 m / s 2 v = u at v = u - a t 0 = u at 0 = u - a t or t = u a = 100 8.3 104 t = u a = 100 8.3 10 4 = 1.2 103s = 1.2 10 - 3 s
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