Somewhere a month or two ago, there was a discussion about E=mc^2 and the question of what the c^2 represents. The answer was that c^2 was simply a conversion unit, to put it in more common units of kg, m and s. That, if the formula were considered in more natural distance units of light seconds, it resolves to simply E=m. Could someone elaborate? Does it mean that, say, one gram of mass, if converted to energy, could apply a force that would move a gram of mass one light-second per second squared? Or some such?