"For over 200 years the equations of motion enunciated by Newton were believed to describe nature correctly, and the first time that an error in these laws was discovered, the way to correct it was also discovered. Both the error and its correction were discovered by Einstein in 1905.Newtonâs Second Law, which we have expressed by the equation F=\frac {d\left({mv}\right)}{dt} was stated with the tacit assumption that m is a constant, but we now know that this is not true, and that the mass of a body increases with velocity. In Einsteinâs corrected formula m has the value m=\frac {{m}_}{\sqrt} where the ârest massâ m0 represents the mass of a body that is not moving and c is the speed of light, which is about 3Ă105 kmâ secâ1 or about 186,000 miâ secâ1."
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Richard Feynman, The Feynman Lectures on Physics, Vol. I, Ch. 15. The Special Theory of Relativity
https://en.wikiquote.org/wiki/Speed_of_light
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Speed of light
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