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20. A boy is standing on a horizontal massless rotating wheel with his hands stretched. Kinetic energy of boy is120 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 |
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Answer» 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 |
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