Question

What powers gravity?

Answer 1

Gravity of the earth pulls it downward, doing work on the ball and giving it kinetic energy.  When you do work against gravity, you store energy in the gravitational field as gravitational potential energy, which then gravity uses to do work on that object   .... hope it helps

Answer 2

Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects.