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

Question

( A ) $6.4 \times 10^{11} Joules$
( B ) $6.4 \times 10^{10} Joules$
( C ) $6.4 \times 10^9 Joules$
( D ) $6.4 \times 10^8 Joules$