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A point P lies on the axis of a ring of ...

A point P lies on the axis of a ring of mass M and radius a at a distance a from its centre O. A small particle of mass m starts from P and reaches O under gravitational attraction only. Its speed when it reaches O is

A

`sqrt((2GM)/a)`

B

`sqrt((2GM)/a(1-1/sqrt2))`

C

`sqrt((2GM)/a (sqrt2-1))`

D

0

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The correct Answer is:
B
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