A point mass m collides with a disc of m...

A point mass m collides with a disc of mass m and radius R resting on a rough horizontal surface as shown . Its collision is perfectly elastic. Find angular velocity of the disc after pure rolling starts

`((2u)/(3R))`

`((3u)/(3R))`

`((5u)/(3R))`

`((2u)/(5R))`

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