For non-accelerating masses, or more precisely within an inertial reference frame
Relatively speaking?
Einstein's E=mc^2 is only for stationary masses
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Re: Einstein's E=mc^2 is only for stationary masses
#12Actually, it's not just stationary masses, but it does apply only to things in linear motion - rotation is specifically excluded, as (IIRC) he makes clear in the appendix to his book on relativity...