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[" A balloon has "2g" of air.If a "],[" ...

[" A balloon has "2g" of air.If a "],[" small hole is pierced into it,"],[" the air comes out with a "],[" speed of "2ms^(-1)" .If the ballon "],[" shrink completely in 5s,the "],[" average thrust experienced "],[" by the balloon is "]

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