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A partcle rests on the top of a hemisphere of radiu R. Find the smallest horizontal velocity that must be imparted to the particle if it is to leave t

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A partcle rests on the top of a hemisphere of radiu R. Find the smallest horizontal velocity that must be imparted to the particle if it is to leave the hemisphere without sliding down it-
A. `sqrt(gR)`
B. `sqrt(2gR)`
C. `sqrt(3gR)`
D. `sqrt(5gR)`
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Correct Answer - A
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