A ball having velocity v towards the right and having angular velocity clockwise approaches the wall. It collides elastically with wall and moves towards the left. Ground and wall are frictionless. Select the correct statement about the angular velocity of the ball after the collision.

Question

A ball having velocity v towards the right and having angular velocity clockwise approaches the wall. It collides elastically with wall and moves towards the left. Ground and wall are frictionless. Select the correct statement about the angular velocity of the ball after the collision., It will be anti-clockwise, It becomes zero, Angular speed decreases, It will be clockwise

MARKS App · Accepted Answer

As collision is elastic, so after collision ball moves towards left with speed v . As walls and ground are smooth, there is no tangential torque on the balls. Only normal forces and m g force pass through the centre of the ball. So, their torques about its centre are zero. By τ = I α , angular acceleration is zero, hence angular velocity does not change.

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