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.

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 point P(Rsqrt(3),0,0) lies on the axis of ring of mass M and radius R the ring is located in YZ plane with its centre at origin O A small particle of mass m starts from P and reaches O under gravitatinal attracton only its speed at O will be

A point P (Rsqrt(3)m,0,) lies on the axis of a ring of mass M and radius R. The ring is located in y -z plane with its centre at origin. A small particle of mass m start from P and reaches O under gravitational attraction only. Its speed at O will be.

A point P(R sqrt(3),0,0) lies on the axis of a ring of mass M and radius R. The ring is located in yx-plane with its centre at origin O. A small particle of mass m starts from P and reaches O under gravitational attraction only. Its speed at O will be

A point P(R sqrt(3),0,0) lies on the axis of a ring of mass M and radius R. The ring is located in yx-plane with its centre at origin O. A small particle of mass m starts from P and reaches O under gravitational attraction only. Its speed at O will be