The Difference Between the Mass in F Equals Ma and the Mass and Equals Mc Squared

The mass in F equals ma is a entity that's located in a Cartesian grid at a certain location. And it has a property of exerting a force, the force of gravity on other masses in the region or anywhere,. frankly, in the universe. So, and as I understand it, whether or not that story is correct, the math works. As long as you're talking about things of the size of planets and baseballs rather than traveling at speeds approaching speed of light.