1.

A ball is projected vertically down with an initial velocity from a height of 20 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.          \[20\,m{{s}^{-1}}\]   
B.          \[15\,m{{s}^{-1}}\]
C.          \[10\,m{{s}^{-1}}\]
D.                       \[5\,m{{s}^{-1}}\]
Answer» B.          \[15\,m{{s}^{-1}}\]


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