Asatellite completes one revolution of a planet in almost exactly one hour. at the end of one hour, the satellite has traveled 2.0 × 10 7 meters and is only 10 meters away from its starting point. what is the numerical value of the satellite's average velocity after that one hour?

Velocity  =  (Displacement)  /  (travel time)

Displacement =
   (distance between start-point and end-point,
    regardless of the route traveled).
or
   (location at the end of the trip)
     minus (location at the beginning of the trip).

At the end of the trip, the satellite is located 10 meters behind the
place where it started.  So its displacement is -10 m referenced to
the launch direction.

Its average velocity is 

             (-10 m) / (1 hour)
in the direction
             of its launch azimuth.

If we call the launch direction the positive direction,
then the satellite's average velocity for the hour is

                 -10 meters/hour .