Question

Oh no! You did not stop in time as you were trying to brake to avoid getting in an accident. If your velocity changed from 29 m/s to 15 m/s all within 2.3 seconds, what is the acceleration you hit the car in front of you as you tried to stop?

NOTE: Are you accelerating or decelerating in this case? How will this affect your acceleration value?
A. 6.1 m/s2
B. -0.4 m/s2
C. -6.1 m/s2
D. -1.8 m/s2

Answer 1

C. -6.1 m/s2

Step-by-step explanation:

a = (vf - vi) / t = (15 m/s - 29 m/s) / 2.3 s = -6.1 m/s2

You are decelerating (slowing down); value is negative