Relativistic Energy - Georgia State University
http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/releng.html
Conservation of Energy The relativistic energy expression E = mc 2 is a statement about the energy an object contains as a result of its mass and is not to be construed as an exception to the principle of conservation of energy.Energy can exist in many forms, and mass energy can be considered to be one of those forms. "Energy is the ultimate convertable currency."
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