Design a "bungee jump" apparatus. A bungee jumper falls from a high platform with two elastic cords tied to the ankles. The jumper falls freely for a while, when the cord is slack. Then the jumper falls an additional distance when the cord is increasingly tense. Assume that you have cords that are ten meters long, and that the cords stretch in the jump for an additional 20 meters for an average jumper. Make a series of simple diagrams, like a comic strip, showing the platform, the jumper, and the two cords at various times in the fall and the rebound. On each diagram, draw and label vectors representing the forces acting on the jumper, and the jumper's velocity. Make the relative lengths of the vectors reflect their relative magnitudes.