Justin moves a desk 480m across a level floor by pushing on, Ask an Expert

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Justin moves a desk 4.80m across a level floor by pushing on it with a constanst horizontal force of 340N. (it slides for a negligibly small distance before coming to a stop when the force is removed.) Then changing his mind he moves it back to its starting point, again by pushing with a constant force of 340N.

a) what is the change on the desks gravitional potential energy during the round trip?

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