Answers

2014-07-23T18:11:11+08:00
A student weighing 500. N stands on a spring scale in an elevator. If the scale reads 520. N, the elevator must be

Answer: 
moving upward at constant speed

The force that the student exerts on the scale is the reaction force of the normal force that the elevator exerts on the student. N = 520. NSince the weight is 500 N which is less than the normal force, the net force of the student is 20 N upwards. Thus, the elevator must be accelerating upward.
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