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A thin ring of mass 2kg and radius 0.5 m...

A thin ring of mass 2kg and radius 0.5 m is rolling without on a horizontal plane with velocity 1m/s. A small ball of mass 0.1kg, moving with velocity 20 m/s in the opposite direction hits the ring at a height of 0.75m and goes vertically up with velocity 10m/s. Immediately after the collision

A

the ring has pure rotation about its stationary `CM`

B

the ring comes to a complete stop

C

friction between the ring ground is to the left.

D

there is no friction between the ring and the ground.

Text Solution

Verified by Experts

The correct Answer is:
A, C
Since momentum of ball and ring has same magnitude but they are opposite in direction and final momentum of ball after the collision in horizontal direction is zero, therefore the ring has pure rotation about its stationary `CM` just after collision (assuming non-impulsive friction).
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