A pi meson of mass m decays at rest into a muon (mass m) and a neutrino

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A pi meson of mass mπ decays at rest into a muon (mass mμ) and a neutrino of negligible or zero mass. Show that the kinetic energy of the muon is KEμ = (mπ - mμ)2 c2 / (2 mπ).
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