APFIVE Relativistic Velocity Addition
Two spaceships A and B are moving along the same line. From an inertial reference frame, spaceship A moves at 0.5c and spaceship B moves at 0.8c in the opposite direction. What is the speed of spaceship B as measured from spaceship A’s reference frame?
A
0.3c
B
(0.5c + 0.8c)/(1 + 0.5c·0.8c/c²)
C
0.8c - 0.5c
D
1.3c
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