12, A 75 kg parachutist leaps from a plane that is initially moving at 100 m/s. He then falls a distance of 400 m to the ground (activating his parachute along the way). He lands gently on the ground, with a speed of 2.2 m/s. Assume that the gravitational zero in your system is the ground. a. How much kinetic energy (in J) did the parachutist have the Instant he jumped from the plane? b. How much gravitational potential energy [in J) did the parachutist have the instant he jumped from the plane? c. How much energy (in J) was lost to air resistance caused by drag and the parachute during the fall