Galaxy A is moving away from us with a speed of 0.80c relati

Best Writers physics Galaxy A is moving away from us with a speed of 0.80c relati

physics

Galaxy A is moving away from us with a speed of 0.80c relati

Galaxy A is moving away from us with a speed of 0.80c relative to the earth. Galaxy B is moving away from us in the opposite direction with a relative speed of 0.45c. Assume that the earth and the galaxies are moving at constant velocities, so they are inertial reference frames. How fast is galaxy A moving according to an observer in galaxy B?

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