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My answer is 5 kg. Do you know? Weight is a synonym of Mass.

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Mass and weight are the same thing on Earth, but they are not when there's a change of gravity, and the words are not synonyms. If you go to the Moon your mass will not change, but you will weigh less. And in outer space you will weigh nothing but your mass will still be the same.

It's important to realise this because if you wanted to calculate how much thrust to use to change the speed or direction of a space vehicle, the mass of that vehicle would be a very important part of the calculation, even though it's weightless.

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14y ago

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