I would like to ask everyone who may know something about E=MC^2

C is the constant right? The Speed of Light?

If light shone from an object traveling at 1/2 the speed of light is still going just as fast as light emmitted from an object traveling 1/4 the Speed of Light in relation to the other object, the Constant can be given the value of 1, 1 being the rate at which light travels regardles of how fast you are going.

Ok so now the constant is 1

So then we have E=M*1^2

or E=M

why did einstein add the extra C^2 then if it can simplify further?