Exam tomorrow. Warning to everybody, please, do not study at the last minute. It's never as good. I'm trying to right now. It isn't working. I am almost in panic.

F= GmM/r^2

Yes. Indeed. And since F = mv^2/r, mv^2/r = GmM/r^2
v^2 = GmM/r
v = sqrt(GmM/r)

AAAAAAAH