v34

Options

A.
B.
C.
D.

Answer

A

Explanation

For the uniformly accelerated/decelerated motion, `v^(2)= u^(2) +- 2gh`
So, from this equation, we can say v-h graph is parabola.

Initially, velocity is downwards (-ve), after collision, it reverses the direction with smaller magnitude and velocity is upwards (+ve). So, graph (a) satisfies these conditions. Also, When t=0, h=d
Velocity increases downwards `(0 rarr A)`
When t=1, velocity reverses its direction `(A. rarr B)`