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A championship weight lifter did 1.10 x 10^4 J of work on a set of barbells weighing 3680 N. How much gravitational potential enegery did the

A championship weight lifter did 1.10 x 10^4 J of work on a set of barbells weighing 3680 N. How much gravitational potential enegery did the barbells have at the maximum height of the lift?Nancy weighed her empty backpack with a spring scale. She found that the pack weighed 8.1N. Suppose she picks up her backpack from a desktop and lifts it through a height of 42 cm. How much gravitational potential energy does the backpack gain?

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