Justin moves a desk 4.80m across a level floor by pushing on it with a constanst

Question

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 b how much work is done? I know a) = 0 but i dont know how much work is done . I keep getting the wrong answer i used the W=dN but i dont knw if thats right

Explanation / Answer

work done = 340*4.8 =1632 J,,,,,,,pushing back workdone = -1632 J,,,,,,,,,,total workdone= 0 J

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