An inertial observer observes two spaceships moving directly toward one another. She measures one to be traveling

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An inertial observer observes two spaceships moving directly toward one another. She measures one to be traveling at \(0.7 c\) in her inertial frame and the other at \(0.9 c\) in the opposite direction. What is the magnitude of the relative velocity that each spaceship measures the other to have?

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