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A point P lies on the axis of a fixed ri...

A point `P` lies on the axis of a fixed ring of mass `M` and radius `a`, at a distance `a` from its centre `C`. A small particle starts from `P` and reaches `C` under gravitational attraction only. Its speed at `C` will be.

A

`sqrt((2GM)/(a))`

B

`sqrt((2GM)/(a)(1-(1)/(sqrt()2)))`

C

`sqrt((2GM)/(a)(sqrt()2-1))`

D

Zero

Text Solution

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The correct Answer is:
B
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