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MY GRANSON NEEDS TO MAKE A ROCKET THAT EJECTS FROM A LAUNCH PAD IN HIS CLASSROOM? Answered

I am not sure what solution we can put together that will make the rocket go in the air.

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Spring.

Blower. (I remember making a decent-flying, but not very durable, rocket out of a cardboard tube with more cardboard for fins and nosecone, launched using the exhaust from my mother's vacuum. She wasn't particularly happy with my borrowing it for this purpose.)

Lever, with a pulled string to activate it and throw the rocket forward.