Eli5: why when I’m standing on a moving train and I jump, the train doesn’t move around me?
In: Physics
You’re already moving the same speed as the train.
If the train were to suddenly stop while you were mid-jump, you would find yourself moving forward.
Case in point: Some years ago, a US Navy submarine hit an uncharted underwater mountain while cruising.
A couple sailors died, many more injured, because they were moving the same speed as the sub when it hit the mountain. Once it impacted, you have a bunch of unsuspecting humans being thrown around in a cramped environment made of steel.
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