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A construction worker, 28 feet up on a scaffold, lifts a 4-lb rope hand over...

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A construction worker, 28 feet up on a scaffold, lifts a 4-lb rope hand over hand up to the scaffold to raise a cement block weighing 7 pounds off the ground. (Assume the rope is 28 feet long.) How much work (in ft-lb) is required to pull the rope and the block up to the scaffold?

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