Motion in A Straight Line

Question: A mass \[m\] slips along the wall of a semispherical surface of radius \[R\]. The velocity at the bottom of the surface is

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1) \[\sqrt {Rg} \]
2) \[\sqrt {2Rg} \]
3) \[2\sqrt {\pi Rg} \]
4) \[\sqrt {\pi Rg} \]
Solution: Explanation: Explanation
Motion under Gravity

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