120 Rocket Balloon

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When the air was still trapped in the balloon, the total momentum of the system (consisting of balloon and the air inside) was zero.

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When the air gushes out from the balloon, the air attained a downward momentum. In order of the total momentum of the system to remain zero, the balloon must attain an upward momentum.

That’s how jet propulsion works. The thrust of a rocket results from the high speed ejection of the rocket fuel.

 

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