The statements below describe four airplanes that have identical masses. Which airplane has the greatest amount of gravitational potential energy? an airplane traveling at 700 kilometers per hour (km/h) at an altitude of 3,000 meters an airplane traveling at 400 km/h at an altitude of 5,000 meters an airplane traveling at 600 km/h at an altitude of 5,000 meters an airplane traveling at 350 km/h at an altitude of 6,000 meters