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Question: 

A spaceship passes you at a speed of 0.850c. You measure its length to be 44.2 m. How long would it be when at rest?

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

Quick Answer: 

$83.9 \textrm{ m}$

Giancoli 7th Edition, Chapter 26, Problem 1

(1:60)

Chapter 26, Problem 1 is solved.

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