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Suppose Jack on top of a 40-foot building, and a rope is hanging from the roof...

Suppose Jack on top of a 40-foot building, and a rope is hanging from the roof to the ground. If the rope weighs 3 pounds per foot, how much work does Jack perform if:

a) he lifts the entire rope onto the roof?

b) he lifts Mr. Q (weighing 250 pounds) from the ground halfway to the roof using the rope?

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