A weightlifter holds a 2,000 N 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 200 N.


Required:

a. How much work (in J) is required to lift the barbell to a height of 2 m?

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