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A block of mass m moving on a fixed smoo...

A block of mass m moving on a fixed smooth hemisphere of rudius R. If speed of block at top most point of the hemisohere is `sqrtgR` as shown in the figure, then the angle (`theta`) with the vertical, where the normal contact force becomes zero will be

A

`cos^-1(frac{2}{3}`

B

`cos^-1(frac{1}{3})`

C

`cos^-1(frac{1}{2})`

D

Zero

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