Justin moves a desk 5.0 m across a level floor by pushing on it with a constant

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Justin moves a desk 5.0 m across a level floor by pushing on it with a constant horizontal force of 340 N. (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 340 N.
(a) What is the change in the desk's gravitational potential energy during the round-trip? (b) How much work has Justin done on the desk?
(c) If the work done by Justin is not equal to the change in gravitational potential energy of the desk, then where has the energy gone?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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