- #1
michael879
- 698
- 7
I know it increases mass, since KE = 1/2 mv^2 and as you approach the speed of light KE keeps going up meaning mass must go up. I've been told that this is simply an increase in relativistic mass (the e=mc^2 type) and gravity is based on rest mass. But isn't it kind of weird for everything except gravity to use total mass while gravity only uses rest mass?