A ball is projected vertically down with an initial velocity from a height of 20 m on to a horizontal floor. During the impact it loses 50% of its energy and rebounds to the same height. The velocity of projection is (g=10 ms^(-2))

A ball is projected vertically down with an initial velocity from a he

1.	A ball is projected vertically down with an initial velocity from a height of 20 m on to a horizontal floor. During the impact it loses 50% of its energy and rebounds to the same height. The velocity of projection is (g=10 ms^(-2))
Answer» `20 ms^(-1)` `15 ms^(-1)` `10 ms^(-1)` `5 ms^(-1)` ANSWER :A