Question: An observer on earth sees an alien vessel approach at a speed of 0.60c. The enterprise comes to the rescue (fig. 26-12), overtaking the aliens

An observer on earth sees an alien vessel approach at a speed of 0.60c. The enterprise comes to the rescue (fig. 26-12), overtaking the aliens while moving directly toward earth at a speed of 0.90c relative to earth. What is the relative speed of on vessel as seen by the other?

Enterprise Vz = 0.90c v = 0.60c

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