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put some water in the rocket
attach the pump
pump air into the rocket (for pressure)
release it and it flies VERY fast, it would easily knock a tooth out
The rocket flies one way, and the water flies the other way.
If there were nothing going backwards, the rocket could not go forward.
The ROCKET/WATER provide what is called a "force
pair". Forces always occur in pairs. You have probably
heard of Newton's third law, which many people state like this: every
action has an equal and opposite reaction.
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