When a driver presses the brake pedal, his car stops with an acceleration of -2.1 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 13 m/s?

A. 13.2 m
B. 40.2 m
C. 44.1 m
D. 3.10 m

Question

When a driver presses the brake pedal, his car stops with an acceleration of -2.1 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 13 m/s?

 		A.	13.2 m
 		B.	40.2 m
 		C.	44.1 m
 		D.	3.10 m

matt101 · Answer

We have acceleration (a), initial velocity or v(i), and final velocity or v(f) all provided in the question. We want to find distance (d). That means we should use the following equation of motion:

$$v_f^2=v_i^2+2ad$$
By plugging in your numbers and solving for d, you should get your answer! Watch the positives/negatives!

anonymous · Answer

Thanks