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Galaxy A is moving away from us with a speed of 0.70c relative to the earth. Galaxy B is
moving away from us in the opposite direction with a relative speed of 0.50c. 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?
_______ C
Solution
v=v1-v2=0.7c-(-0.5c)=1.2c

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