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Question: 

A negative muon traveling at 53% the speed of light collides head on with a positive muon traveling at 65% the speed of light. The two muons (each of mass $105.7 \textrm{ MeV/c}^2$) annihilate, and produce how much electromagnetic energy?

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

Quick Answer: 

$260 \textrm{ MeV}$

Giancoli 7th Edition, Chapter 26, Problem 42

(1:48)

Chapter 26, Problem 42 is solved.

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