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All things being equal, the speed of a rocket or jet depends on the power of the engine, the weight of the vehicle and the drag on the vehicle. But rockets do have some advantages: They can travel in space where there is no drag. Jets require air. It is possible to build very powerful rockets with very little weight. Jets are heavier for the same power. Of course, jets are made for continuous use. Rockets are frequently one-time use.

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17y ago

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