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A partcle rests on the top of a hemisphe...

A partcle rests on the top of a hemisphere of radius R. Find the smallest horizontal velocity that must be imparted to the particle if it is to leave the hemisphere without sliding down :

A

`sqrt(gR)`

B

`sqrt(2gR)`

C

`sqrt(3gR)`

D

`sqrt(5gR)`

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The correct Answer is:
A
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