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A boy is standing on a horizontal massless rotating wheel with his hands stretched Kinetic...

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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 8 Pusa Road New Delhi 110005 Ph 011 47623456

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