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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?

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

Quick Answer: 

$0.3c$

Giancoli 7th Edition, Chapter 26, Problem 53

(1:48)

Chapter 26, Problem 53 is solved.

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