Question

Explain why is it dangerous to jump out of a moving train.

Answer 1

When you jump off a train, you jump off a certain height and your downwards (vertical) velocity is zero. But your forward (horizontal) velocity is not. You will hit the ground on split second with your horizontal velocity practically the same as the train.

Things get funny now. Most likely you are not a circus artist nor a skydiver, and you attempt to land on your feet. That means your deceleration (read: slowing down) happens in a split second.

It means you will experience several negative gees on slowing down. Remember deceleration is negative acceleration, right? And remember the law of conservation of energy, right? That energy cannot be created from nothing nor destroyed? And you certainly do conserve your kinetic energy here.

Your bones and joints are likely to fracture by the force. But even worse is to follow. Humans are 70% liquid, and they stand negative acceleration far worse than positive. The negative acceleration will literally tear your innards off their ligaments, leading into serious internal bleeding and an unexpected visit by a man dressed in black and carrying an antiquated agricultural implementation. This may help you

Answer 2

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$\longmapsto$When a passenger jumps out of a fast moving bus, his feet on touching the ground come to rest, whereas the upper part of his body continues to move forward due to inertia of motion.As a result, if he does not run forward he falls with his face downwards.