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Your friend shines a laser beam at you while flying towards you in a spaceship at 100 kilometers per second. You measure the speed of the laser beam to be 300000 kilometers per second. How fast would the laser beam move towards you if your friends spaceship was stationary (in kilometers per second)?
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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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