HELP ASAP!! People who do chin-ups raise their chin just over a bar, supporting themselves only by their arms. Typically, the body below the arms is raised by about 30 cm in a time of 1 s, starting from

HELP ASAP!!

People who do chin-ups raise their chin just over a bar, supporting themselves only by their arms. Typically, the body below the arms is raised by
about 30 cm in a time of 1 s, starting from rest. Assume that the entire body of a 680 N person who is chinning is raised this distance and that 0.5 s
is spent accelerating upward and 0.5s accelerating downward, uniformly in both cases. Find the force his arms must exert on him during the
accelerating part of the chin-up.
762 N
742 N
705 N
700 N

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