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A porter with a suitcase on his head is climbing up step of flight with uniform speed work done by the weight of the suit case on the suit case is



The answer is 0. As the direction of dispacement is perpendicular to the direction of force! Force is downward while displacement of suitcase is forward so,
Work done = F*d*cos90 = 0, since cos90 = 0
0 0 0
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