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.

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

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

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

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

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