A heavy rope, 40ft long, weighs 0.7lb/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. 670 ft-lb
b. 650 ft-lb
c. 560 ft-lb
d. 630 ft-lb
e. 660 ft-lb


c. 560 ft-lb

Mathematics

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