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[" 45.A ball is thrown vertically downwa...

[" 45.A ball is thrown vertically downwards from a "],[" height of "20m" with an initial velocity "v_(0)" .It "],[" collides with the ground loses "50" percent of "],[" its energy in collision and rebounds to the same "],[" height.The initial velocity "v_(0)" is : "12015RS" ? "],[" (Take "g=10ms^(-2)" ) "]

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