A tennis ball is dropped from 1.12 m above the ground. It rebounds to a height of 0.822 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s 2 .
(1/2) m v^2 = m g h
v^2 = 2 g h = 2 * 9.81 * 1.12
v = 4.7 m/s downward
v^2 = 2 g h = 2 * 9.81 * 1.12
v = 4.7 m/s downward