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8. A 1500-1b elevator is suspended by a 250-ft cable that weighs 10 1b/ft. How much work is required to raise the elevator from the basement to the fifth floor, a distance of 50 ft? Circle the correct answer. (A) 187,500 ft-1b (B) 87,500 ft-1b (C) 112,500 ft-1b (D) 12,500 ft-1b (E) 75,000 ft-1b