Rover was thrown from his owner's airplane after the owner discovered that Rover was no "plane broken" (house broken or the plane.) Luckily, Rover thought to wear his parachute on the plane. He opened it immediately as her was hurled out of the door. After several seconds, Rover had drifted to a position of 200 meters above the ground. Compute (if possible) his potential energy at this location above the ground. Rover has a mass of 4 kg. Explain your answer.