A person conducts an experiment in which he rides in an elevator while standing on a set of
scales that displays his weight in pounds. Let a be the elevator's upward acceleration relative to the earth. The
forces acting on the person are his weight W = 150 lb and the force N exerted on him by the scales.
1. If the scales read 155 lb, what is the elevator's acceleration?
2. If the elevator's acceleration is a = —2 ft/s2 , what the scales read?
