(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

My teacher has written in his lecture notes that

For massive relativistic particles, E = 0.5mv^{2}= p^{2}/2m.

2. Relevant equations

3. The attempt at a solution

I don't understand why the particle has to be massive for the equation to work.

Please help!!

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# Homework Help: Relativistic particles

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