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Question: 

In an Earth reference frame, a star is 49 light-years away. How fast would you have to travel so that to you the distance would be only 35 light-years?

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

Quick Answer: 

$0.70c$

Giancoli 7th Edition, Chapter 26, Problem 5

(1:26)

Chapter 26, Problem 5 is solved.

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