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 
of its energy and rebounds to the same height. The initial velocity of its projection is (Take, 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let the ball be projected vertically downward with velocity 
from height 
.
Total energy at point 
During collision, loss of energy is 
and the ball rises up to same height. This means it possesses only potential energy at same level.
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