russ_watters said:You mean an experience to which c^2 is relevant? Certainly.
That doesn't come from e=mc^2. All e=mc^2 tells you is how much energy is released by converting a given mass to energy (the energy equivalency of mass).
free_mind, even setting aside your initial error in thinking c^2 was still a velocity, now it seems like you're looking for a physical significance to a fragment of an equation. C^2 has no more or less significance on its own than D^2 has in the Newtonian gravity equation.
The connection between atomic bombs and e=mc^2 is subtle. A nuclear explosion is not caused by the transformation of matter and energy. I already knew this connection, but the problem is that I don't know any pratical experience in which the "full" formula has been proved.
c^2 couldn't be interpreted as if it was a simple mathematic factor that result from a development of other equations. Einstein didn't choose the speed of light for "c" by chance.