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>> $A ball of mass m moves towards a moving$

Question

A ball of mass m moves towards a moving wall of infinite mass with a speed 'v' along the normal to the wall. The speed of the wall is 'u' toward the ball. The speed of the ball after elastic collision with wall is

A

$u + v$ away from the wall

B

$2 u + v$ away from the wall

C

$∣ u - v ∣$ away from the wall

D

$∣ v - 2 u ∣$ away from the wall

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Updated on : 2022-09-05

Solution

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Correct option is B)

In the frame of wall, the ball moves towards it with speed $u + v$ and due to momentum conservation velocity after collision returns with velocity $u + v$ in the direction in which wall is moving.
So from the ground frame, the velocity of ball after collision with wall is $2 u + v .$

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