The Orbital Speed ( S ) of an Earth Satellite

The orbital speed ( s ) of an earth satellite is related to its distance ( r ) from the earth's center by the formula . If the satellite's orbital speed is meters per second, find its altitude a (in meters) above the earth's surface, as shown in the illustration. Round the answer to the nearest meter.

A) 4,397
B) 21,478
C) 19,331,856
D) 19,333,456
E) 19,330,256