8. A weightlifter holds a 1000N barbell 1 meter above the ground. One end of a 2 meter long chain hangs from the center of the barbell. The chain has a total weight of 500 N. How much work is required to lift the barbell to a height of 2 m? What is the average force exerted by the weightlifter in the process? (average with respect to height of the barbell from the ground)

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