Astronomers on Earth, an Inertial Reference Frame, Observe Galaxies a and B

question 5

Multiple Choice

Astronomers on Earth, an inertial reference frame, observe galaxies A and B that are moving away from the Earth as shown.The speeds indicated are those measured by the astronomers on Earth.What is the speed of galaxy B as measured by an observer in galaxy A?

• A)0.22c
• B)0.60c
• C)0.71c
• D)0.95c
• E)1.42c

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