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Originally Posted by Dilbert1234567
or if you throw it at the observer, you can hit him with it at 150 kph (ouch)
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Which comes to another interesting concept, the speed of light.
If the speed of light is a fixed value, how fast is light on the train going?
If it is relative to the train, then to an observer outside light is going faster than the speed of light.
If it is not relative to the train (because of its fixed universal speed) then to a passenger on the train, the speed of the light will have slowed.
(or: is light that is -on the train- going at relative speed to the train, and light that -exits the train- going at relative speed to the ground. Which means that at the front window of the train there should be an increasing volume of light)
I expect someone to be able to explain it clearly, but it's always been a nice mental puzzle for me.
