Question

A ball projected from ground at a certain angle collides a smooth inclined plane at the highest point of its trajectory. If the collision is perfectly inelastic then after the collision, ball will(a) come to rest(b) move along the incline(c) retrace its path.

Answer 1

Move along incline after coming from rest as it is an inelastic collision i. e TOTAL loss of its kE ENERGY

Answer 2

Answer :

If a ball is projected from the ground at a certain angle and it collides inelastically on a smooth inclined plane at the highest point of its trajectory, then after the collision ball will move along the incline, so the correct option of the question is option b).

Explanation:

• When the trajectory is at its highest point, the ball will only have velocity in the horizontal direction, and the vertical component of the velocity will become zero.
• Since the collision is perfectly inelastic, the value of e will be 0.
• So, as e = 0, the ball will not bounce back as the final kinetic energy will become 0 due to e.

• Hence, the ball will come to rest, and only a component of gravity along the plane will be applied on it, so it will attain a motion along the plane only.

#SPJ3