# The speed of the outflow of gases relative to the launching rocket is no more than 4 km / s. How can a rocket reach the first

The speed of the outflow of gases relative to the launching rocket is no more than 4 km / s. How can a rocket reach the first and even second cosmic speeds?

It follows from the law of conservation of momentum that the mass of the fuel must be several times the mass of the rocket. The maximum effect will take place with instant fuel consumption (explosion), which entails gigantic overloads even if the rocket design is preserved. In a real, relatively slow process of fuel combustion, it is necessary to use the formula of K.E. Tsiolkovsky to calculate the speed of the rocket: v = u In Mo / Mk where and is the velocity of the outflow of combustion products; Mo is the mass of the entire rocket with fuel at the start; Mk is the mass of the missile structure with a payload.

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