a 1240 kg satellite orbits the earth at an altitude of 80.4 km. it is desired to increase the altitude of the orbit to 334 km. how much energy must be added to the system to effect this change in altitude? the universal gravitational constant is 6.67259 × 10−11 n · m2 /kg2 ,, the radius of the earth is 6.37 × 106 m , and its mass is 5.98 × 1024 kg . answer in units of mj.