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Statement of a problem № 2557

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A rocket standing on its launch platform points straight upward. Its jet engines are activated and eject gas at a rate of 1500 kg/s. The molecules are expelled with a speed of 50 km/s. How much mass can the rocket initially have if it is slowly to rise because of the thrust of the engines?

Solution:
A rocket standing on its launch platform points straight upward. Its jet engines

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