Homework Help: Physics

Posted by Jim Kirk on Tuesday, September 28, 2010 at 5:34am.

A person doing a chin-up weighs 615.4 N,
disregarding the weight of the arms. During
the ﬁrst 21.0 cm of the lift, each arm exerts
an upward force of 435 N on the torso.
The acceleration of gravity if 9.81 m/s
2
.
If the upward movement starts from rest,
what is the person’s speed at this point?
Answer in units of m/s.

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