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weight lifter jerks 220 kg vertically thrometers and holds still at that heighto minutes. The works done by him in lifd in holding it still are respectively2201, 330J2334 J, 10 J52) 3234 J, 04) 0, 3234 J |
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Answer» Dear Student ,Here in this case the work done by lifting the weight 220 kg through 1.5 m is equal to the change in potential energy .So the work done = change n potential energy = mgh = 220 x 10 x 1.5 = 3300 JBut the work done in holding the weight at the same height for two minutes is zero . thanks |
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