The earth and galaxies are moving at constant velocities

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Galaxy A is moving away from us by a speed of 0.85c relative to the earth. Galaxy B is moving away from us in the opposite direction by a relative speed of 0.40c. Assume that the earth and the galaxies are moving at constant velocities, thus they are inertial reference frames. How fast is galaxy A moving according to an observer in galaxy B?

Reference no: EM13661590

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