# An observer on Earth observes two space- craft moving in the same direction toward the Earth. Spacecraft A appears to have a speed of 0.34 c, and spacecraft B appears to have a speed of 0.85 c. What is the speed of spacecraft A measured by an observer in spacecraft B? Answer in units of c.

An observer on Earth observes two space- craft moving in the same

direction toward the Earth. Spacecraft A appears to have a speed of 0.34 c, and spacecraft B appears to have a speed of 0.85 c. What is the speed of spacecraft A measured by an observer in spacecraft B? Answer in units of c.

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The post An observer on Earth observes two space- craft moving in the same direction toward the Earth. Spacecraft A appears to have a speed of 0.34 c, and spacecraft B appears to have a speed of 0.85 c. What is the speed of spacecraft A measured by an observer in spacecraft B? Answer in units of c. appeared first on Superb Professors.