Motion in A Plane

Question: A small disc is on the top of a hemisphere of radius \[R\]. What is the smallest horizontal velocity v that should be given to the disc for it to leave the hemisphere and not slide down it ? [There is no friction]



1) \[v = \sqrt {2gR} \]
2) \[v = \sqrt {gR} \]
3) \[v = \frac{g}{R}\]
4) \[v = \sqrt {{g^2}R} \]
Solution: Explanation: Explanation
Non-uniform-circular-motion

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