Question: The spaceship Enterprise 1 is moving directly away from earth at a velocity that an earth-based observer measures to be +0.65c. A sister ship, Enterprise

The spaceship Enterprise 1 is moving directly away from earth at a velocity that an earth-based observer measures to be +0.65c. A sister ship, Enterprise 2, is ahead of Enterprise 1 and is also moving directly away from earth along the same line. The velocity of Enterprise 2 relative to Enterprise 1 is +0.31c. What is the velocity of Enterprise 2, as measured by the earth-based observer?

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