Consider a rubber ball freely falling from a height ` h = 4.9 m` onto a horizontally elastic plate. Assume that the duration of collision is negligible and the collisions with the plate is totally elastic .
Then the velocity as a function of time and the height as a function of time will be :

Options

A. .
B. .
C. .
D. .

Answer

C

Explanation

`h = (1)/(2) g t^2 v = -g t` and after the collision, `v = g t`
(parabolic)(straight line)
Collision is perfectly elastic then ball reaches to same height again with same velocity.