Question

A tennis ball is dropped on the floor from a height of
10 m. It rebounds to a height of 5 m. The ball was in
contact with the floor for 0.01 s. What was its average
acceleration during the contact ? (g=10m/s)
(1) 800 m/s2
(2) 200 m/s
(3) 1600 m/s2
(4) 2400 m/s​

Answer 1

Answer

Taking downward motion as positive direction. Negative signs here is used because the ball moves against the gravity in bouncing back.