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Question: 

What is the speed of a pion if its average lifetime is measured to be $4.40 \times 10^{-8} \textrm{ s}$? At rest, its average lifetime is $2.60 \times 10^{-8} \textrm{ s}$.

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

Quick Answer: 

$2.42 \times 10^8 \textrm{ m/s}$

Giancoli 7th Edition, Chapter 26, Problem 4

(1:39)

Chapter 26, Problem 4 is solved.

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