A car's velocity changes from 32m/s to 96m/s in an 8.0-s period. what is its acceleration?

|Acceleration| = (change in speed) / (time for the change)

Change in speed = (speed at the end) minus (speed at the beginning).

Change in speed = (96 m/s - 32 m/s) = 64 m/s

|Acceleration| = (64 m/s) / (8.0 sec) = 8.0 m/s²

This solution is written in terms of speed and the absolute value

of acceleration. The question gives no information regarding the

direction of motion at any time, so it's not possible to say anything

about velocity, or the direction of acceleration.