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posted by dan on Thursday, May 10, 2012 at 11:48am.
I got 15.6 but it was wrong? Ace raised a 14.0-N physics book from a table 72 cm above the floor to a shelf, 2.20 m above the floor. What was the change in potential energy?
ΔPE = m•g•ΔH =14•(2.2-0.72) = 20.72 J
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