A sphere A is moving with a speed ‘u’ and rotating with an angular velocity $ω$ , makes a head - on elastic collision with an identical stationary sphere B. There is no friction between the surfaces of A and B. Disregard gravity

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A will stop moving but continue to rotate with an angular velocity $ω$

A will come to rest and stop rotating

B will move with a speed “u” without rotating

B will move with a speed “u” and rotate with an angular velocity $ω$

answer is A, C.

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Detailed Solution

There is an exhanges of linear velocities. However the two spheres cannot exert torques on each other, as their surfaces are frictionless, and the angular velocities of the spheres do not change.

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