1. The problem statement, all variables and given/known data My physics teacher has given me a project to design some kind of device to allow landing from 5,000 feet without a parachute. So far we have been taught nothing but forces, velocity, acceleration, displacement, and vectors so I'm kind of at a loss. First step of the project is to find out how much force a person will experience hitting the ground when he jumps off a plane with just a wingsuit ( http://en.wikipedia.org/wiki/Wingsuit_flying ), so naturally I used force = mass x acceleration, but then then I noticed that the acceleration for gravity is always 9.81 m/s^2, which means that the altitude doesn't even matter! So obviously I am missing something, but what is it? To make things even more complicated, the wingsuit gives the sky diver a lot more drag, I know the drag equation which seems easy enough to calculate, but I'm not sure what the drag coefficient or reference area is. Also, does the wing suit actually create lift even though the sky diver is going straight down? Or does lift need some kind of horizontal movement? Oh and one more thing, does anyone know the maximum amount of force a human body can take and still survive? 2. Relevant equations F = MA 3. The attempt at a solution Tried to use F = MA, but got stuck on the acceleration part.