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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.

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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_______.

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Machenical energy consevation law

Ui + Ti = Uf + Tf 

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