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A circular plate is rotating in horizont...

A circular plate is rotating in horizontal plane about an axis passing through its center and perpendicular to the plate with an angular velocity `omega`. A person sits at the center having two dumbbells in his hands.When he stretches 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 `E//x`. The value of x is______

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