Multiple Choice
Spacecraft A is traveling at a speed of 0.80 c relative to Earth. Spacecraft B is traveling in the same direction as spacecraft A but at a speed of 0.40 c relative to spacecraft A. The speed of spacecraft B relative to Earth is
A) 0.08 c.
B) 0.80 c.
C) 0.85 c.
D) 0.91 c.
Correct Answer:

Verified
Correct Answer:
Verified
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