e=mc^2 is equivalent to e=m.89875517873681764 m/s The speed of light is a constant. How this is possible in reality? Is not possible to have a body traveling at this speed, because simply doesn't exists (or at least we don't discover it yet). I already read several answers to this kind of question. But the answers are around the intrinsic mathematical need to square c in the formula e=mc^2. I am looking for a logical reason for this problem, because beyond mathematical reasoning there are the reality; many times the mathematic coincides with reality, but in this problem, is what it happens? I look for help to eliminate my difficulty in understanding this. Thank you.