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Q.The loaded cab of an elevator has a mass of 2500 kg and moves 215 m up the shaft in 22 s at constant speed. At what average rate does the force from the cable do work on the cab?

Q. What must the charge (sign and magnitude) of a particle of mass 1.49g be for it to remain stationary when placed in a downward-directed electric field of magnitude 700 N/C?

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