A ball of mass 
is thrown vertically down from a height of 
. It collides with the floor and loses 
of its energy and then rises back to the same height. The value of its initial velocity is
A
zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
: Given, mass of the ball, 
Height, 
Let the initial velocity be 
.
Initial energy at height 
,
Energy of the ball after collision,
Since, the ball rises back to the same height 
, therefore,
or 
or 
or 
or 
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