The mass of a spaceship is 1000kg. It is to be launched from the earth's surface out into free space. The value of g and R (radius of earth) are `10m/s^2` and 6400 km respectively. The required energy for this work will be:

Explanation

The launch the spaceship out into free space, from energy conservation `-(GMm)/R+E=0`
`E=(GMm)/R=((GM)/(R^(2)))mR=mgR=6.4xx10^(10)J`