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Raju dropped a rubber ball of mass m from a height h to the ground. He observed that the ball rebounds vertically and along the same line to a height h1, which is less than h.1. Is it an elastic or inelastic collision?2. Find the velocity with which it strikes the ground?3. If it is replaced by a solid aluminium ball, then what happens to the height of rebound?4. If the rubber ball is allowed to fall on a spring placed on the ground then what change will Raju notice in the height of rebound? |
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Answer» 1. Inelastic collision. 2. The velocity with which ball strikes the ground, v2 = u2 + 2as v2 = 0 + 2g × h v = \(\sqrt {2gh}\). 3. Height of rebound decreases. 4. Height of rebound depends on the state of potential energy stored in the spring. If ball falls on a compressed spring, the height of rebound increases due to potential energy given by the spring to bail. |
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