Question

20. A boy is standing on a horizontal massless
rotating wheel with his hands stretched. Kinetic
energy of boy is 120 J. If he now folded his hands
then M.I is reduced to 80%. Then a new K.E. of
boy,
(1) Increases by 30 J (2) Decreases by 30 J
(3) Increases by 20 J (4) Remains constant
​

Answer 1

Explanation:

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