Consider a rubber ball freely falling from a height h = 4.9 m 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 the height as function of time will be

Options

A.
B.
C.
D.

Answer

C

Explanation

As we know that for vertical motion, ` h= (1)/(2) g t ^(2) " " `[parabolic]
and after the collision, (straight line).
Collision is perfectly elastic, then ball reaches to same height again and again with same velocity .

Hence, option (C) is true.