A ball is projected vertically down with an initial velocity from a height of \( 20 \mathrm{~m} ...

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A ball is projected vertically down with an initial velocity from a height of \( 20 \mathrm{~m} \) onto a horizontal floor. During the impact it loses \( 50 \% \) of its energy and rebounds to the same height. The initial velocity of its projection is
[EAMCET (Engg.) 2000]
(a) \( 20 \mathrm{~ms}^{-1} \)
(b) \( 15 \mathrm{~ms}^{-1} \)
(c) \( 10 \mathrm{~ms}^{-1} \)
(d) \( 5 \mathrm{~ms}^{-1} \)
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