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Lavalamp22
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Homework Statement
People who do chin-ups raise their chin just over a bar (the chinning bar), supporting themselves only by their arms. Typically, the body below the arms is raised by about 30cm in a time of 1.0s , starting from rest. Assume that the entire body of a 760N person who is chinning is raised this distance and that half the 1.0s is spent accelerating and the other half decelerating, uniformly in both cases.
Homework Equations
S=Vot+(1/2)at^2
The Attempt at a Solution
I thought I had the right answer, but mastering physics is saying it's wrong, and I don't know what's wrong.
.3=(0*.5)+.5*a*.5^2
.3=1/2a*.25
2.4=a
F=ma
F=(77.55)(2.4)
F=186.12N