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

Everything inside the train is moving with the train, *including the air inside*. When you’re on the roof, you’re moving with the train but the outside air is still stationary. When you jump, you keep your forward momentum, as you would if you were on the train, but this time your body is trying to move forward through stationary air, which slows it down.