# Who Is The Observer?

Two space shuttles are in co-linear movement, and they will collide one against the other.

If the space shuttle A is traveling with a velocity of $$0.7c$$ and the space shuttle B is traveling with a velocity of $$0.8c$$. If you are in Shuttle A, what is the velocity of B relative to you?

Definition: $$c$$ is the speed of light.

×