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Q. A falling skydiver has a mass of 54.5 kg. What is the magnitude of the skydiver's acceleration when the upward force of air resistance has a magnitude that is equal to one-fourth of his weight?

Q. The loaded cab of an elevator has a mass of 4.3 x 10^3 kg and moves 207 m up the shaft in 21 s at constant speed. At what average rate does the force from the cable do work on the cab?

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