Work Done By Constant Force: gravitational force; escalator force

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A 75.0 kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.60 m. What is the work done on the man by (a)the gravitational force and (B) the escalator?

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Solution. Denote the vertical distance and the mass of the man by h ...

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The solution includes the calculations and an explanation.

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