A 15.0 kg rocket is to be launched vertically from the surface of a planet with mass 6.50×1023 kg, a radius of 3.50×106 m, and no atmosphere. If the rocket is launched with an initial kinetic energy of 7.20×107 J, what will its kinetic energy (J) be when it is 4.50× 106 m from the center of the planet? 6.73×106 7.89×106 1.27×107 2.44×106 3.07×107 8.02×106 5.71×106 4.44×106 5.03×106 8.67×106