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Question: 

At what speed $v$ will the length of a 1.00-m stick look 10.0% shorter (90.0 cm)?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$0.436c$

Giancoli 7th Edition, Chapter 26, Problem 6

(1:22)