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Question: 

A certain type of elementary particle travels at a speed of $2.70 \times 10^8 \textrm{ m/s}$. At this speed, the average lifetime is measured to be $4.76 \times 10^{-6} \textrm{ s}$. What is the particle’s lifetime at rest?

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

Quick Answer: 

$2.07 \times 10^{-6} \textrm{ s}$

Giancoli 7th Edition, Chapter 26, Problem 2

(0:51)

Chapter 26, Problem 2 is solved.

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