the minimum velocity of the space craft to escape from the gravitational force must be required
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That means “an object should have a minimum of 11.186 km/s initial velocity to escape from earth's gravity and fly to infinite space.”
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A spacecraft leaving the surface of Earth, for example, needs to be going about 11 kilometers (7 miles) per second, or over 40,000 kilometers per hour (25,000 miles per hour), to enter orbit. Achieving escape velocity is one of the biggest challenges facing space travel.
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