Suppose a weightlifter lifts an 87 kg barbell from chin height up to a position 0.75 meters higher than their chin. a. How much work does the weightlifter do in raising the barbell through this distance? b. How much work is done by gravity acting on the barbell during this motion? c. What is the change in Gravitational Potential Energy (GPE) of the barbell as it moves from chin to highest point?

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