I guess that if you exclude potential energy, this is roughly the case. Or - given that the equation is not simply E=v... lets say that energy is associated with movement - bit it vibration, rotation or tranlation.
My tertiary physics is rusty though. Probably some better educated TFPer (or just a smarter person) will see a flaw. And shit... I never mastered general relativity, so I'm just a dumbo.
At the same time also... objects gain mass as they gain energy (yes?). Couldn't you just as easily claim that all energy is mass? Quantum Mech. "teaches" us not to read too much into the equations. At the end of the day - the universe is more complex than our basic analogies. IMHO that is.
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