As a spaceship moving toward you at half the speed of light fires a probe toward you, relative to itself at 0.7 the speed of light, you see the probe approaching at about
A)0.70c.
B)0.87c.
C)0.89c.
D)0.92c.
E)0.96c.

Question

Quizplus · Accepted Answer

Using the relativistic velocity addition formula, the velocity of the probe relative to you is calculated as (0.5c + 0.7c) / (1 + (0.5 * 0.7)) = 0.89c.

As a Spaceship Moving Toward You at Half the Speed