A Heavy Rope, 40 Ft Long, Weighs $0.8$ Lb/ft and Hangs Over the Edge of a Building 110

A heavy rope, 40 ft long, weighs $0.8$ lb/ft and hangs over the edge of a building 110 ft high. How much work is done in pulling the rope to the top of the building?

A) $710 \mathrm{ft}-\mathrm{lb}$
B) $730 \mathrm{ft}-\mathrm{lb}$
C) $750 \mathrm{ft}-\mathrm{lb}$
D) $740 \mathrm{ft}-\mathrm{lb}$
E) $640 \mathrm{ft}-\mathrm{lb}$

Correct Answer:

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