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A particle is given an initial speed u i...

A particle is given an initial speed `u` inside a smooth spherical shell of radius `R=1` m such that it is just able to complete the circle. Acceleration of the particle when its velocity is vertical is

A

`g sqrt(10)`

B

`g`

C

`g sqrt(2)`

D

`3g`

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The correct Answer is:
A
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