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Work at Lifting and Lowering Phase

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A weight lifter is bench-pressing a barbell whose mass is 85 kg. He raises the barbell a distance of 0.65m above his chest and then lowers the barbell the same distance. The weight is raised and lowered at a constant velocity. Determine the work done by the weight lifter during (a) the lifting phase and (b) the lowering phase.

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The solution provides calculations for the work done by a bench-pressing weight-lifter during the lifting phase and the lowering phase.

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Since the weight is raised at a constant velocity, it shows ...

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