A ball rolls down a ramp for 15 seconds. If the initial velocity of the ball was 0.8m/s and the final velocity was 7m/s, what was the acceleration of the ball?

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

Change in speed = (ending speed) - (starting speed)

= (7.0 m/s) - (0.8 m/s) = 6.2 m/s

Time for the change = 15 seconds

Acceleration = (6.2 m/s) / (15 sec)

= (6.2/15) m/s²

= 0.413 m/s²