Question

hello..
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a child is standing with folded hand at the centre of platform rotating about its central axis. the kinetic energy of system is K .the child now straight his arm so that the moment of inertia of system Doubles. what is the new kinetic energy of the system?

if u dont know...do not answer..

Answer 1

centre sicking force / centripetal force

Answer 2

Yo buddy here's your answer

its because of centripetal force

hope it helps