Determine how much reduced mass of the rocket if

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Determine how much reduced mass of the rocket, if some time after the launch of its speed is v = 69 m / s, and the relative speed of the output of the combustion products u = 30 m / s. air resistance and gravity acceleration is not considered.

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Task 10149. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.


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