Question

A ball is dropped vertically from a height 'd' above the ground. it hits the ground and bounces up vertically to a height d/2 neglecting air resistance its velocity 'v' varies with height 'h' above the ground as

Answer 1

The graph between h and v will be a parabola. At h=dh=d , velocity is zero,( Taking downward direction as negative)Then its negative value increases, and at h=0h=0 velocity gets reversed and then goes on decreasing and becomes zero at h=d/2h=d/2Hence a is the correct answer.

Answer 2

What is the meaning of parabola ?