Homework Help: physics

Posted by ari on Tuesday, October 23, 2012 at 6:16pm.

A 83-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 0.76 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.8 s, and then comes to rest. What does the spring scale register in each of the following time intervals?

(a) before the elevator starts to move

(b) during the first 0.76 s of the elevator's ascent

(c) while the elevator is traveling at constant speed

(d) during the elevator's negative acceleration

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