Typical Physics Question?

Posted on 2015-09-26 08:54:00 in Physics by ABBOT

A 85 kg man stands on a spring scale in
an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.6 m/s in 0.81 s. It travels with this constant speed for the next 7.2 s, undergoes a uniform negative acceleration for 1.61 s, and comes to rest.

A. What does the spring scale register before the elevator starts to move?
The acceleration of gravity is 9.8 m/s/s. Answer in units of N.

B. What does the spring scale register during the first 0.81 s? Answer in units of N.

C. What does the spring scale register while the elevator is traveling at constant speed? Answer in units of N.

D. What does the spring scale register during the negative acceleration? Answer in units of N.

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