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Question: 

Your spaceship, traveling at 0.90c, needs to launch a probe out the forward hatch so that its speed relative to the planet that you are approaching is 0.95c. With what speed must it leave your ship?

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: 

$0.3c$

Giancoli 7th Edition, Chapter 26, Problem 53

(1:48)

Chapter 26, Problem 53 is solved.

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