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which of the following case is work done positive negative or zero a.work done by a Porter has given lifting it from the platform on to his head b.work done by the force of gravity on a suitcase at the suitcase falls down from the porters head c. work done by a person on a book held in his hand while walking with uniform speed on a horizontal Road in briefly |
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Answer» A is negative the porter is lifted upward the workdone by the gravity is negative |
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