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Velocity transformation: What is the speed of ship A as observed from ship B? Of ship B as observed from ship A?

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Two spaceships approach the Earth from opposite directions. According to an observer on the Earth, ship A is moving at a speed of 0.753c and ship B at a speed of 0.851c. What is the speed of ship A as observed from ship B? Of ship B as observed from ship A?

Answers: 0.978 and -0.978

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