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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 `R`, at a distance `2R` from its centre `O`. A small particle starts from `P` and reaches `O` under gravitational attraction only. Its speed at `O` will be

A

zero

B

`sqrt((2GM)/(R))`

C

`sqrt((2GM)/(R)(sqrt5-1))`

D

`sqrt((2GM)/(R)(1-(1)/(sqrt5)))`

Text Solution

Verified by Experts

The correct Answer is:
D
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