Help in calculating the orbiting height of a satellite?

[jms4]

I have a satellite orbiting at a velocity of 3850Km/hr around planet Earth in a circular orbit, please help me in calculating it's height of orbit. I do know that the closer a satellite is, the faster it's orbital velocity, and the farther it is the slower it would be, and help me with the formulas?

 

[John Park]

Can you calculate the force on the satellite? Do you know how to calculate the acceleration in a circular orbit?