A 75-kg man stands on a spring scale in an elevator.  During the first 3 seconds of motion from rest, the tension T in the hoisting cable is 8300 N.  Find the reading R of the scale in newtons during this interval and the upward velocity v of the elevator at the end of the 3 seconds.  The total mass of the elevator, man, and scale is 750 kg.

Question

A 75-kg man stands on a spring scale in an elevator.  During the first 3 seconds of motion from rest, the tension T in the hoisting cable is 8300 N.  Find the reading R of the scale in newtons during this interval and the upward velocity v of the elevator at the end of the 3 seconds.  The total mass of the elevator, man, and scale is 750 kg.

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