56. A spaceship S1 is moving away from us at a speed of 0.8 c. Another spaceship S2 is moving away from us in the opposite direction at a speed of 0.5 c. What is the speed of S1 measured by an observer on S2?
(A) 1.3 c
(B) 1.0 c
(C) 0.97 c
(D) 0.93 c
(E) 0.89 c
詳解 (共 1 筆)
未解鎖
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