Originally Posted by XEMON
Think about it like this:
When you put your hand out of the window of the car on a freeway and a fly hit you it stings a bit, but if a rock hit you, it will brake your hand ...
As for FPS vs. J I agree with el17e76 limiting energy would make more sense than limiting velocity ...
But last I played in France we still used FPS ... It might have changed since then ... I hope ... :P
It is easier to measure speed than energy. Would need some very well calibrated and durable equipment at fields to measure energy.