The diagram shows a hemispherical shell ...

The diagram shows a hemispherical shell of mass m and radius R is hinged at point of placed on a horizontal surface. A ball of mass strikes the shell at point A ( as shown in the figure ) moving with velocity u inclined at an angle `theta = tan^(-1) (1/2)` and then it stops . For the given shell to reach horizontal surface OP what minimum speed u is required ?

A

`2sqrt((gR)/3)`

B

`sqrt((2gR)/3)`

C

`(gR)/sqrt5`

D

Not possible

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The correct Answer is:

D

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