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Physics question, help please 10 pts for correct answer!?

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Nancy weighed her empty backpack with a spring scale. She found that the pack weighed 8.1 N. Suppose she picked up her backpack from a desktop and lifts it trhough a height of 42cm. How much gravitaional potential energy does the backpack gain. Show work please.

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  1. E = w*h = 8.1*0.42 = 3.4 J

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