A particle of mass m moves in a circle on a smooth horizontal plane with velocity v0 at a radius R0. The mass is attached to a string which passes through a smooth hole in the plane as shown. The tension in the string is increased gradually and finally it moves in a circle of radius R0/2. The final value of the kinetic energy is

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answer is D.

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Detailed Solution

According to law of conservation of angular momentum about the centre of the circle, Li = Lf Final K.E of the particle

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