Global positioning system (GPS) satellites use nearly round orbits about 20200 km above the earth's surface. Determine the orbital speed of a GPS satellite required to keep the satellite in orbit.

• A. 4440 m/s
• B. 7460 m/s
• C. 3870 m/s
• D. 14000 m/s
• E. 7910 m/s
• F. 6890 m/s

Answer: (C)