What is the speed of spacecraft b as measured by a express


Two spacecraft fly away from Earth, traveling in exactly opposite directions. As measured by an observer on Earth, spacecraft A travels at a speed of 0.392c and spacecraft B travels at a speed of 0.909c. What is the speed of spacecraft B as measured by A? Express answer as a decimal fraction of c.

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Physics: What is the speed of spacecraft b as measured by a express
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