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

Positive and negative pions, denoted [tex]\pi[/tex] + and[tex]\pi[/tex] - , are antiparticles of each other.

Each has a rest mass of 140 MeV/c^2. Suppose a collision between an electron and positron, each with kinetic energy K, produces a [tex]\pi[/tex]+ , [tex]\pi[/tex]- pair. What is the smallest possible value for K?

2. Relevant equations

E=mc^{2}

3. The attempt at a solution

E(kinetic)=E(total)-E(at rest)

I need to fine Kinetic Energy, but I do not know how to find E(total). E at rest is 140 MeV

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# Homework Help: Electron-Positron Collision finding Kinetic Energy

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