A 72-kg man stands on a spring scale in an elevator.
Chapter 4, Problem 4.75(choose chapter or problem)
A 72-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.80 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.5 s, and then comes to rest. What does the spring scale register (a) before the elevator starts to move? (b) during the rst 0.80 s of the elevators ascent? (c) while the elevator is traveling at constant speed? (d) during the elevators negative acceleration?
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