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为什么火箭能够飞上天？

火箭能够飞上天是因为它利用了牛顿第三定律，即“作用力与反作用力相等且反向”，火箭通过喷射燃料产生的推力，反向地推动它自身，从而产生向上的飞行力。火箭的推力足够大，可以克服地球的引力，使它能够脱离地面飞向太空。

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