It is a conglomeration of rock that collected together over time, and it rotating in a spinning ball that is orbiting a sun that is in the middle of our solar system.
You should look at a picture of the earth from a satellite.<span />
Explanation:
Below is an attachment containing the solution.
By the work energy theorem, the total work done on the stone is given by its change in kinetic energy,

We have


Then the total work is
