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A body of mass m is on the top point of ...

A body of mass m is on the top point of a smooth hemisphere of radius 5 m. It is released to slide down the surface of the hemisphere. It leaves the surface when its velocity is 5 `m//s`. At this instant the angle made by the radius, vector of the body with the vertical is

A

`30^@`

B

`45^@`

C

`60^@`

D

`90^@`

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