http://hyperphysics.phy-astr.gsu.edu/Hbase/relativ/einvel.html#c1(adsbygoogle = window.adsbygoogle || []).push({});

ok, so i'm looking at this, and i see that

where c = speed of light

if ship A is moving at .7c to the right ===> <=== and ship B moving .7c to the left

and they are both on the same line and about to collide, at what velocity (in C) will they hit each other.

the reference point is the collision point of impact not some distant observer.

Theory i read appears that C + X = C but this seems to violate common sense.

I can even imagine that you can't possible surpass the speed of light, but can someone make this a little more obvious.

Thanks, and this is not a HW question, i'm in EE. i'm just asking for the fun of it.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Einstein Velocity addition

**Physics Forums | Science Articles, Homework Help, Discussion**