A spaceship approaches the Moon, traveling at 0.5c with respect to the Moon. Its crew shines a laser at the Moon. The beam strikes a lunar mirror and is reflected back to the ship. The crew on the ship will measure the speed of the reflected beam to be
A. 1.5c.
B. 0.75c.
C. 2.0c.
D. c.
E. 0.5c.
Answer: D
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