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E=mc2 is only valid in the rest frame of the system. The formula in a non-rest frame is E^2 - p^2*c ^2=m^2*c^4 See https://en.wikipedia.org/wiki/Four-momentum for more details.
E=mc2 is only valid in the rest frame of the system. The formula in a non-rest frame is E^2 - p^2*c ^2=m^2*c^4 See https://en.wikipedia.org/wiki/Four-momentum for more details.