Physics-
General
Easy
Question
Consider a rubber ball freely falling from a height 
onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time will be
The correct answer is:
(paraboli(c)
and after the collision, 
(straight line)
Collision is perfectly elastic then ball reaches to same height again and again with same velocity
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