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Inside a smooth hemispherical cavity, a ...

Inside a smooth hemispherical cavity, a particle P can slide freely. The block having this cavity is moving with constant acceleration a = g (where g is acceleration due to gravity). The particle is released from the state of rest from the topmost position of the surface of the cavity as shown. The angle `theta` with the vertical, when the particle will have maximum velocity with respect to the block is

A

`45^(@)`

B

`60^(@)`

C

`30^(@)`

D

`0^(@)`

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The correct Answer is:
A
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