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CGP EDU Academic Team
Published on: September 12, 2026
A circular plate is rotating in horizontal plane, about an axis passing through its centre and perpendicular to the plate, with an angular velocity 
. A person sits at the centre having two dumbbells in his hands. When he stretched out his hands, the moment of inertia of the system becomes triple. If E be the initial Kinetic energy of the system, then final Kinetic energy will be 
. The value of x is
Text Solution
Verified by ExpertsThe correct answer is:
3
(3)
The kinetic energy is given by
It is given that the new moment of inertia
Clearly, the final kinetic energy is
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