An object of mass 
is attached to light string which passes through a hollow tube. The object is set into rotation in a horizontal circle of radius 
. If the string is pulled, shortening the radius to 
, the ratio of new kinetic energy to the original kinetic energy is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Kinetic energy of rotation, 
Where, 
, r is radius of circle.
( 
and v is constant)
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