Originally Posted by ho
The body do contribute to the the speed of your arm. But the main power of your arm is not by itself, but by the fact that body slow down:
Run 25m/h on the train with 50m/h your speed is absolutely 75m/h. Now if the train suddenly stop: You will get kill by your enormous speed instantly.
Killed by enormous speed?
What kind of logics is this?
If you got killed from that, it would likely be from slamming your face on the ground or something similar.