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    				| 1. | Explain why tennis ball bounces greater on hills than on planes? | 
| Answer» 1. the acceleration due to gravity g = G M / (Re+h)² Gravity is less at an altitude h from the surface of Earth. Hence, the ball bounces higher. Suppose the ball rebounds with a velocity v. S = distance it rises to = v² / 2 g. As, g is less on mountains, S is more. 2. Also, air pressure is less. The drag resistance due to air is less. So the ball bounces higher. | |