A small mass m is rotating on a circular...

A small mass m is rotating on a circular path of radius ton a smooth horizontal table with speed V. The centripetal force is provided by a light inextensible string tied to m and passing through a hole in the table at the centre of the circle and having a mass M hanging at its lower end. The mass M is suddenly increased to 8M. Find the new radius of the circle and the new velocity of m when the system attains equilibrium

2V and r/2

V/2 and 2r

2V and 2r

V/8 and 4r

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