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The value of GMm is worked out from the first part of the question and then substituted into the second, you dont need the mass of Earth anywhere in the question. And Mumma, the grav potential energy equation is not linear, so you cant use your method.

Gravitational potential energy decreases the further you get away from Earth, so it should be smaller, but im not too sure about that answer

C = Change Ep = Grav. potential energy r = radius C.Ep = -GMm / C.r 1x10^6 = -GMm/(1x10^4) -GMm = 1x10^10 ........................... C.Ep = -GMm / C.r = (1x10^4)/(6x10^5) =166.67 KJ Im pretty sure this is how its done

Re: More Questions Should there be an n in the final answer for 10)c)? nC0 is 1, not n