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. 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
2 
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
: According to law of conservation of angular momentum
or 
(Using (i) )
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