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What is the minimum specific impulse required for a single stage rocket?

What is the minimum specific impulse required for a single stage rocket? Correct Answer 415 s

Usually the specific impulse of rockets is about 300 s which gives us a delta-v of 5.7 km/s. But the minimum specific impulse required by the rocket to escape the earth’s atmosphere is 416 s which is only attained by Space Shuttles. Today, liquid hydrogen/liquid oxygen engines provide that kind of specific impulse.

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