Physics problem... Stumped

ra said

If it's in orbit, it shouldn't be accelerating... it should be at constant velocity.
So 0.

(Discounting the eventual drop to Earth, which I guess would mean that it is slowly.... very slowly... accelerating toward Earth)

Click to expand...

acceleration is not just a change in velocity, but a change in direction as well.

The force that pulls the sat down towards the earth, instead of it flying straight into space, is the acceleration.

I dont want the answer jonesy, just how to set it up, I dont have the mass of the sat so I cant calculate it that way... not sure where to go..