You are arguing over a cell phone while trailing an unmarked police car by 25 m; both your car and the police car are traveling at 110 km/h. Your argument diverts your attention from the police car for 2.0 s (long enough for you to look at the phone and yell, “I won’t do that!”). At the beginning of that 2.0 s, the police officer begins braking suddenly at 5.0 m/s2. (a) What is the separation between the two cars when your attention finally returns? Suppose that you take another 0.40 s to realize your danger and begin braking. (b) If you too brake at 5.0 m/s2, what is your speed when you hit the police car?

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter2: Motion In One Dimension
Section: Chapter Questions
Problem 55AP: A truck tractor pulls two trailers, one behind the other, at a constant speed of 1.00 102 km/h. It...
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You are arguing over a cell phone while trailing an
unmarked police car by 25 m; both your car and the police car are
traveling at 110 km/h. Your argument diverts your attention from
the police car for 2.0 s (long enough for you to look at the phone
and yell, “I won’t do that!”). At the beginning of that 2.0 s, the police
officer begins braking suddenly at 5.0 m/s2. (a) What is the separation
between the two cars when your attention finally returns?
Suppose that you take another 0.40 s to realize your danger and
begin braking. (b) If you too brake at 5.0 m/s2, what is your speed
when you hit the police car?

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