A Satellite Is Held in Orbit by a 1 000-N

Multiple Choice

A satellite is held in orbit by a 1 000-N gravitational force.Each time the satellite completes an orbit of circumference 80 000 km,the work done on it by gravity is:

A) 1.0×10⁸ J.
B) 8.0×10⁸ J.
C) 1.0×10¹¹ J.
D) 0.
E) ​8.0×10¹¹ J.