 #1
danielsmith123123
 21
 4
 Homework Statement:

Calculate the work done by planet X on its moon.
Planet X applies a force of 5.6 x 10^10 N on its moon and the moon is 4.0 x 10^8 km away from the planet and it continues to circle the planet in a circular orbit of circumference of 2.5 x 10^9 m.
 Relevant Equations:
 Gravity
The answer in the textbook says 0J but I am not sure what the concept behind it is. Does it have something to do with gravity?