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A weightlifter holds a1,700N barbell 1 meter above the ground. One end of a 2-meter-long chain hangs from the center of the barbell. The chain

A weightlifter holds a1,700N 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 of700N.How much work (in J) is required to lift the barbell to a height of2 m?

J

What is the average force (average with respect to height of the barbell from the ground) exerted by the weightlifter in the process?

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