Question

*PLEASE HELP*

A 150-kg object takes 1.5 minutes to travel a 2,500-meter straight path. It begins the trip traveling 120 m/s and decelerates to a velocity of 20 m/s. What was its acceleration?

Answer 1

−1.11 m/s2

Explanation:

just took test, got a 100%

Answer 2

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

We don't care about the 150kg or the 2,500 meters. They don't make any difference.