Assertion: A ring is rolling without slipping on a rough ground. It strikes elastically with a smooth wall as shown in figure. Ring will stop after some time while travelling in opposite direction.
Reason: After impact net angular momentum about an axis passing through bottommost point and perpendicular to plane of paper is zero.

Options

A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C. If assertion is true, but the reaction is false.
D. If assertion is false but the reason is true.

Explanation

In second figure. Net angular momentum about bottommost axis
`L=mvR-I_(C)omega`
`=mvR-(mr^(2))((v)/(R))`
`=0`