Chapter 5, Problem 16P

|| BIO Forces during chin-ups. People who do chin-ups raise their c 1in 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 1.0 s. starting from rest. Assume that the entire body of a 690 N person who is chinning is raised this distance and that hall the 1.0 s is spent aece1erating upward and the other half accelerating downward, uniform1y in both cases. Make a free-body diagram of the person’s body. and then apply it to find the force his arms must e.11.ert on him during the accelerating part of the chin-up.