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# Centre-of-mass

Throw a frees-bee. It flies at some speed $v$. But exactly what is moving at that speed $v$? It spins while flying, so each “particle” it is made of moves at different speeds.1 Except for the centre! That point moves at the speed $v$.

But then throw a hammer. What is its “centre”? Which point is moving at the thrown speed $v$? Which point is the hammer itself spinning about?

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