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[" 66.A ball is falling freely from a ce...

[" 66.A ball is falling freely from a certain height."],[" When it reaches "10m" height from the ground "],[" its velocity is "v_(0)." It collides with the "],[" horizontal ground and loses "50%" of its "],[" energy and rises back to height of "10m" .The "],[" value of velocity "v_(0)" is "],[[" 1) "7ms^(-1)" 2) "10ms^(-1)" 3"14ms^(-1)" 4) "16ms^(-1)]]

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