Given that the radius of the earth is 6400 km, the kinetic energy required at the surface of Earth by a 12 tonne spacecraft in order to escape the earth's gravitational field is-
1
1.3 × 106 J
2
7.6 × 1011 J
3
4.4 × 106 J
4
2.9 × 1011 J
5
Question Not Attempted