ELI5, why if you jump inside a moving train you will land on the same spot, but if you jump on the roof of a moving train, you land on a different spot?

Question

seen it on twitter and I can’t get my head around it
EDIT: thanks guys I get it now 😅

In: Physics

Answer 1

When you’re inside the train, basically everything is moving at the same speed (all things being equal).

When you’re outside, there are outside factors that will change where you land – air resistance, wind from any direction, etc.