A point P lies on the axis of a 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 attractiononly. Its speed at C will be

A point P lies on the axis of a ring of mass M and radius a, at a dist

1.	A point P lies on the axis of a 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 attractiononly. Its speed at C will be
Answer» `SQRT((2GM)/a)` `sqrt((2GM)/a(1-1/sqrt2))` `sqrt((2GM)/a (sqrt2-1))` 0 Answer :B