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  1. A car is traveling at a constant speed of 20.8 m/s when the car sees a car in 50.0 meters infront , desides to barke the pedal with a constant acceleration of 4.80 m/s2 and then the car comes at a rest mode. What is the car reaction time?

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Trinidad Tremblay
Trinidad TremblayLv2
5 Mar 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A car is moving at a constant velocity when it is involved inacollision. The car comes to rest after
0.450 s with an average acceleration of 65.0 m/s2 in thedirectionopposite that of the car’s velocity.
What was the speed, in km/h, of the car before the collision?

answer: 105 km/h

A straight road is used to test the driver's reaction time and thecar's acceleration. The driver is instructed to immediately pushthe brake pedal when the car is just passing a white marker postand to keep pressing the brake pedal until the car comes to acomplete stop. The distance from the car to the white post is thenmeasured. The driver's reaction time is the time between when thecar just passes the post and when the brake pedal is pushed, Thedriver's reaction time and the car's acceleration were the same forboth runs. The 1800 kg car is 4 m long. The 50 kg driver is 1.9 mtall.

For the first run, the car was moving at 27.5 m/s when it passedthe white post and stopped 98.6 m from the post.
For the second run, the car was moving at 47.3 m/s when it passedthe white post and stopped 273.7 m from the post.

a) What was the magnitude of the car's acceleration after the brakepedal was pushed?

b) What was the driver's reaction time?

c) For the first run, how much time did it take for the car to stopafter the brake pedal was pushed?

d) For the first run, how far did past the white post did thedriver push the brake pedal?

e) For the first run, how much further did the car travel after thebrake pedal was pushed?

A straight road is used to test the driver's reaction time and thecar's acceleration. The driver is instructed to immediately pushthe brake pedal
when the car is just passing a white marker post and to keeppressing the brake pedal until the car comes to a complete stop.The distance from the car
to the white post is then measured. The driver's reaction time isthe time between when the car just passes the post and when thebrake pedal is pushed,
The driver's reaction time and the car's acceleration were the samefor both runs.
The 1200 kg car is 4.8 m long. The 50 kg driver is 2.2 mtall.

For the first run, the car was moving at 16.5 when it passed thewhite post and stopped 28.7 m from the post.
For the second run, the car was moving at 28.4 when it passed thewhite post and stopped 74.7 m from the post.


a) What was the magnitude of the car's acceleration after the brakepedal was pushed?

1

b) What was the driver's reaction time?

2 s

c) For the first run, how much time did it take for the car to stopafter the brake pedal was pushed?

3 s

d) For the first run, how far did past the white post did thedriver push the brake pedal?

4 m

e) For the first run, how much further did the car travel after thebrake pedal was pushed?

5 m



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