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The speed to let the rocket enter the orbit is ...

vI = 7,91 km/s

vII = 11,19 km/s

vIII = 16,7 km/s

Depends on the weight of the rocket

And cosmic velocity - also referred to as the circular velocity, it is the speed that should be given to the body to enter into orbit around Earth. If a rocket launches from the surface of the earth, then it has to get at least 7.9 kilometers per second to get into orbit.

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wikipedia → Escape velocity

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