A spaceship of mass 2 × 104 kg is launched into a circular orbit close to the earth surface. The additional velocity to be imparted to the spaceship in the orbit to overcome the gravitational pull will be (if g = 10 m/s2 and radius of earth = 6400 km)
(1) 11.2 (√2 -1) km/s
(2) 7.9 (√2 - 1) km/s
(3) 8(√2 -1) km/s
(4) 7.4(√2 - 1) km/s
