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Peter Manchester

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  1. The orginal question confuses the rest energy (mc^2) of a particle with mass, with kinetic energy (1/2 mv^2). A particle with mass m at rest, and no kinetic energy, still has a rest energy derived from its mass. The wikipedia article https://en.wikipedia.org/wiki/Energy–momentum_relation is a very general discussion of the topic, covering both massive and massless particles.
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