I've got two questions which are related and I've always wondered about and got no answer for. (I'm not a physics student and know only basic physics, so the easier explanation the better)
- Two cars traveling at 60km/h in opposite direction. The speed observed by an onlooker is 60 km/h for each car. If you are in the car, the observed speed of the other car is 120km/h. Correct?
We say that speed of light is the fastest you can travel. In the car example (ok, maybe spaceships to be a little more realistic) if they both travel in the speed of light or near. They will observe the
speed of light * 2 Is this possible? or is the actual highest velocity
speed of light /2
- Similar reasoning, if you are in a train travelling in the speed of light, then you are unable to walk forward in that train, since you can't travel faster than the speed of light?