Relativistic Velocity Addition
Two spaceships, A and B, are moving along the same axis in opposite directions. Relative to an inertial reference frame, spaceship A has a speed of 0.5c and spaceship B has a speed of 0.8c. What is the speed of spaceship B as measured from the reference frame of spaceship A?
A
1.3c
B
(0.5c + 0.8c)/(1 + 0.5c·0.8c/c²)
C
0.8c - 0.5c
D
0.3c
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