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[" 8) A ball is thrown vertically downwa...

[" 8) A ball is thrown vertically downwards from a height of "20m" with an initial velocity "v_(0)." It collides with the "],[" ground,loses "50%" of its energy in collision and rebounds to the same height.The initial velocity "v_(0)" is : "],[" (Take "g=10ms^(-2)" ) "]

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