A space-ship is launched into a circular orbit close to the earth’s surface. What additional velocity should now be imparted to the space-ship in the orbit to overcome the gravitational pull? [Radius of earth = 6400 km and g = 9.8 m/s 2 .]
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Sol. The orbital velocity of space ship in circular orbit,
If space ship is very close to earth surface, 
radius of earth 
Here, 
The escape velocity of space ship
Additional velocity required
Therefore, velocity 
must be added to orbital velocity to spaceship to overcome the gravitational pull.
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