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The 'e' Equation

A ball is thr...

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A ball is thrown vertically downwards from a heigh tof 20m with ani nitial velocity v^2.It collides witht h eground,loses 50% of its energy in thec ollision and rebounds to the same height.The initial velocity v is?\lbrack g=10m/s^2\rbrack

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Q. A ball is thrown vertically downwards from a height of

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