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I thought that I should do GMm/r^2 = mv^2/r and solve for r

but if I do it that way i get a wrong answer.

Instead, if I do mg = mv/r^2 and find r, I get the right answer...

For all the other questions involving satellites and space telescopes and stuff, I always used GMm/r^2 somehow... but how come i just use mg for this question???

Thanks for you help! :)