and if possible, how does inertia play (or not play) a part in this?
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Wind resistance, when you jump in a train, all the air around you is relatively motionless, you and the air are moving at the same speed. When you’re on the roof of a train, you are going at the speed of the train and the air is moving at whatever speed and direction it happens to be moving at.
So when you jump and are no longer being propelled forward by the train, the air pushes you.
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