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A particle is given an intial speed u in...

A particle is given an intial speed `u` inside a smooth spherical shell of radius `R` so 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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