1. The problem statement, all variables and given/known data A person reaches a maximum height of 64 cm when jumping straight up from a crouched position. During the jump itself, the person's body from the knees up rises a distance of around 41 cm. To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump. Part A: With what initial speed does the person leave the ground to reach a height of 64 cm? Part B: In terms of this jumper's weight W , what force does the ground exert on him or her during the jump? I figured out the first part, but I can't figure out the second part. :( Also the answer to part B has to be a number? This is online homework and the answer is in the format: F=_____W 2. Relevant equations F=ma 3. The attempt at a solution The velocity for part A was 3.5 I tried to figure out the time by using v=d/t, and got t=.117 seconds which seems wrong. I tried to figure out the a so I used vf-vo/t=29.91??? and using 29.91 as a tried to figure it out. But I'm just stuck. I have no idea.