(Answered) A ball is thrown vertically downwards from a height of 20 m

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A ball is thrown vertically downwards from a height of 20 m with an initial velocity v₀². It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v₀ is (Take g = 10 ms^-2)

(A) 10 ms^-1
(B) 14 ms^-1
(C) 20 ms^-1
(D) 28 ms^-1

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