Question

Imagine a rubber ball is falling freely from a height of 4.9 m on a horizontal elastic plate. Suppose that the time of collision is negligible and plate is perfectly elastic, the sketch of v-t and that of y-t (where v is velocity and y is displacement) will be:

Answer 1

Correct option is : (c)

For ball, \(h= \frac{1}{2}gt^2\)

For straight line v = -gt, after collision, v = gt because collision is perfectly elastic therefore the ball will go upto same height after each collision.

Hence, option (c) is correct.