A boy, standing at the center of a disc, is holding two blocks in his hands. The disc is rotating about a vertical axis through it's center with kinetic energy of the system being 
. When boy stretches his hands, moment of inertia of the system about axis of rotation gets doubled. The new kinetic energy of the system is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
From the conservation of angular momentum,
Rotational energy,
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