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    A rocket in outer space that is moving at a speed of 1.50 km/s relative to an observer fires its motor. Hot gases are expelled out the rear at 2.55 km/s relative to the rocket. What is the speed of the gases relative to the observer?

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    https://brainmass.com/physics/scalar-and-vector-operations/speed-gases-released-rocket-relative-observer-349937

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    This posting discusses what is the speed of the gases released from a rocket relative to the observer.

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