A person reaches a maximum height of 57 cmcm 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 48 cmcm . To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump.

(a) With what initial speed does the person leave the ground to reach a height of 60 cm?

(b) Draw a free-body diagram of the person during the jump.

(c) In terms of this jumper’s weight w, what force does the ground exert on him or her during the jump?