Homework Help: college physics

Posted by justin on Tuesday, September 21, 2010 at 8:12pm.

A 78-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 0.74 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 0.74 s of the elevator's ascent

(c) while the elevator is traveling at constant speed

(d) during the elevator's negative acceleration

college physics - bobpursley, Tuesday, September 21, 2010 at 8:24pm
scalereading=mg+ma where a is upward direction, if downward, negative. a is zero during constant velocity.
college physics - Anonymous, Thursday, October 18, 2012 at 10:13pm
jhh

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