I got the answer to the first part (35,374.04 m), but I'm having trouble with the second. At first, I thought 1,2,3,6 would be the answer, but that was wrong. Then, I said that 2,3,6 would be the answer, but that too was wrong. Now I am thinking that the energy wouldn't matter (momentum, however, would matter). 2 definitely needs to be assumed, as well as 3,4,5, and 6. The answer would change if there was air resistance, the terrain wasn't level (which would in turn that the earth isn't flat), and finally if g was taken to be universal gravity rather than local, the answer would change a bit. Would I be correct to assume 2,3,4,5,6? Thank you.