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Nerull t1_j4iu04b wrote

Putting it in space makes it really easy.

Put the person in a black box. We don't care what happens in the box.

A bullet flies out of the box with momentum +p, the box must gain momentum -p. There is no way around this.

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FriedmanMkIII t1_j4j1tr9 wrote

Yea, but the resultant velocity of the box and bullet would depend on their respective masses.

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