A mass 
moves in a circle on a smooth horizontal plane with velocity 
at a radius 
. The mass is attached to a string which passes through a smooth hole in the plane as shown in the figure.
The tension in the string is increased gradually and finally 
moves in a circle of radius 
. The final value of the kinetic energy is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
According to law of conservation of angular momentum,
So, final kinetic energy of the particle,
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