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 attraction only. 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 attraction only. Its speed at C will be
Answer» `SQRT((2GM)/(a))` `sqrt((2GM)/(a)(1-(1)/(sqrt(2))))` `sqrt((2GM)/(a)(sqrt(2)-1))` zero Answer :B