The relativistic mass equation shows the relationship between relativistic mass and speed. Basically showing that the closer u get to light speed the less relativistic mass you have, but ur rest mass will be the same. I was asked by my friend what the inverse of that formula means. Thus I took the original equation and came up with the inverse: m = sqrt(c^2-(m0c^2/v)^2) I also looked at the graph of the original and the inverse would just be a reflection about y=x. I still can't interpret it. Any hints/ help?