1. The problem statement, all variables and given/known data http://prntscr.com/9huihp Given, Mass of the Earth = 6*1024 Mass of Satellite = 45 kg Radius of Satellite's orbit = 4.2*107 G = 6.67*10-11 Find the velocity of the satellite. 2. Relevant equations Gravitational Force Fg = (G*Me*Ms)/(Rs2) Newton's second law: Fg = Ms*a where a = v2/Rs due to uniform circular motion. 3. The attempt at a solution http://prntscr.com/9huloh http://prntscr.com/9hulwt I feel like I'm being thrown off either by the units being in km/s or by not accounting for the fact that the acceleration vector points in the -x direction, but I don't see why that would affect the magnitude of the velocity. Can anyone point me in the right direction as to what I may be neglecting, because these problems are usually pretty easy for me. *ps. sorry if my writing is not legible enough to read!