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A small block of mass m has speedsqrt(gR...

A small block of mass m has speed`sqrt(gR) /2` at the top most point of a fixed hemisphere of radius R as shown in figure. The angle `theta`, when block loses the contact with the hemisphere is

A

`(cos (0.75)) ^(-1) `

B

`(cos (0.8)) ^(-1) `

C

`(cos (0.6)) ^(-1) `

D

`(cos (0.9)) ^(-1) `

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