| http://www.w3.org/ns/prov#value | - The relativistic formula for momentum, which works for photons as well as massive objects isp2 = (E/c)2 - (mc)2,where E is the total energy due to motion and (possibly) rest mass, and m is the rest mass.To find the momentum of a massive object, we need to subtract the rest mass energy from the total; hence the second term on the right hand side.
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