A ball is projected vertically down with an intial velocity from a height of 20 m on to a horizontal - Science -

Question

A ball is projected vertically down with an intial velocity from a
height of 20 m on to a horizontal floor During the impact it loses
50 percent of its energy and rebounds to the same height, what will
be the initial velocity of its projection?

Vara · Accepted Answer

Dear
Student,
Please find below
the solution to the asked query:
50% of (PE+KE)=PE12×mgh+12mv2=mgh2gh+v2=4ghv=2gh=2×9
8×20=19 8 m/s
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A ball is projected vertically down with an intial velocity from a height of 20 m on to a horizontal floor. During the impact it loses 50 percent of its energy and rebounds to the same height, what will be the initial velocity of its projection?