How do you figure 120mph? It's ~1kg and I would guess has a higher surface area relative to mass than a person whose terminal velocity is about 120mph. In any

How do you figure 120mph? It's ~1kg and I would guess has a higher surface area relative to mass than a person whose terminal velocity is about 120mph. In any event, it takes a person 8s to get close to terminal velocity — that's a drop of 300m or so. The energy involved is certainly non trivial but energy is not the whole story. The densest, heaviest pieces will be the battery and motors.