A Satellite Is in a Circular Orbit About the Earth

Multiple Choice

A satellite is in a circular orbit about the Earth at a distance of two Earth radii above the surface.What is the speed of the satellite? (The radius of the Earth is 6.4 × 10⁶ m,and G = 6.67 × 10−¹¹ N × m²/kg². )

A) 2 800 m/s
B) 4 600 m/s
C) 5 600 m/s
D) 17 000 m/s