Question

You are arguing over a cell phone while trailing an unmarked police car by 32 m. Both your car and the police car are traveling at 110 km/h. Your argument diverts your attention from the police car for 2.5 s (long enough for you to look at the phone and yell, "I won't do that!"). At the beginning of that 2.5 s, the police officer begins emergency braking at 5 m/s2.

(a) What is the separation between the two cars when your attention finally returns? (Hint: This problem might be a bit easier to solve using the idea of relative velocity.)

----------- m

b) Suppose it takes you another 0.4 s to realize your danger and begin braking. If you too brake at 5 m/s², what is your speed when you hit the police car?

----------- km/h

(c) How much time passes between your initial braking and the collision?

------------ s

(d) How much distance do you cover during this time (i.e., while braking)?

------------ m

Answer 1

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