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Q. |
A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding? |
A. | 4 metres |
B. | 3 metres |
C. | 2 metres |
D. | 1 metre |
Answer» C. 2 metres | |
Explanation: The potential energy of a body when raised through height h is given by mgh. Each time, a normal rubber ball hits the floor, it loses one-fifth of its total energy and the rebound height is proportional to energy, so each bounce will rebound to four-fifth of the previous bounce. |
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