A ball falls under gravity from a height of 10 m with an initial downward velocity u. It collides with the ground, losses 50% of its energy in collision and then rises back to the same height. The initial velocity u is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
: If m is the mass of the ball, then its total initial energy at height h.
Energy after collision = 50% of 
As the ball rebounds to height h, so.
Or 
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