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Question: 

In the rare decay $\pi^+ \rightarrow \textrm{e}^+$ + $\nu_\textrm{e}$, what is the kinetic energy of the positron? Assume the $\pi^+$ decays from rest and $m_\nu = 0$.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$69.3 \textrm{ MeV}$

Giancoli 7th Edition, Chapter 32, Problem 24

(10:34)

Chapter 32, Problem 24 is solved.

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