A boy is seated in a revolving chair revolving at an angular speed of 120 rev.per minute

A boy is seated in a revolving chair revolving at an angular speed of 120 rev.per minute. Two heavy balls form part of the revolving system and the boy can pull the balls closer to himself or may push them apart. If by pulling the balls closer the boy dcreases the Moment of Inertia from 6 kgm2 to 2 kgm2. What will be new angular speed?

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