Came across another question during my exam review. Seems to me like there is insufficient data again. When the space shuttle delivers a crew to the international space station, it usually boosts the orbit of the station from about 320 km to 350 km. How much energy does the shuttle add to the stations orbit? Orbital energy is given as: E = -GMm/(2r) The energy gain would be the difference from the initial energy and final energy. But how can you solve it without being given the mass (ans is 1.48E10 J)?