A parachutist is going to jump onto the planet Jupiter. His parachute slows him down at a rate of 20 m/s squared with a force of 10,000N. Before pulling his parachute he fell a distance of 768 meters in 8 seconds. He is still 100 meters above the surface, and he already has a kinetic energy of 1,000,000J. If his parachute broke at 100 meters, what would be his velocity when he hits the ground?