Do you mean E= mc2 ? If so it is multiplied by the speed of light squared. That is just the ratio that is required. It's kind of like asking; "Why do we multiply the diameter of a circle by pi to get it's circumference?" Because that ratio gives you the right answer. "C squared" is the ratio needed to show how much energy is contained in a certain quantity of mass, which is a huge amount.
1 year ago
Last edited at 9:01AM on 12/1/2012
Whenever you convert mass to pure energy, the resulting energy is by definition moving at the speed of light. It shows the relationship of mass, or matter to energy. The understanding of this is fundamental, because the universe is made up of energy in one form or another.