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For an object of mass the energy required to escape the Earth's gravitational field is GMm / r, a function of the object's mass (where r is the radius of the Earth, G is the gravitational constant, and M is the mass of the Earth, M =5.9736Ã10 24 kg).or a mass equal to a Saturn V rocket, the escape velocity relative to the launch pad is 253.5 am/s (8 nanometers per year) faster than the escape velocity relative to the mutual center of mass.
Answer Wiki. To get to an approximately circular low earth orbit and stay there, a rocket needs to accelerate whatever vehicle it is delivering into space up to about 8 km per second relative to the earth. Of course, the rocket starts at a speed of 0 (right at liftoff) and accelerates rapidly to reach that speed, discarding stages along the way.