posted by dale .
A rubber ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 5.5 m/s. After 0.35 s, the ball is moving toward the paddle with a speed of 5.5 m/s. What is the average acceleration of the ball during that 0.35 s? Give magnitude and direction.
Call away direction +
acceleration = change in velocity / change in time
= (Vfinal - Vinitial) / (Tfinal - Tinitial)
= (-5.5 - 5.5) / .35
A skateboard rider starts from rest and maintains a constant acceleration of 10.50 m/s2 for 8.4 s. what is the rider's displacement during this time?