I can’t remember the law, was it archimedes principle or displacement but abt moving from one place to another is doing something, moving from one place to another then coming back to the same place is doing nothing displacement.

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You make me think 🤔 and seduce my mind 💋 @jack

I think it’s just displacement vs distance definitions. If you go 10 units one way then back 10 units in the opposite direction you, at the end, traveled a distance of 20 units but your total displacement was zero.