Answer
$U = -1.18\times 10^{11}~J$
Work Step by Step
We can find the gravitational potential energy:
$U = -\frac{GMm}{r}$
$U = -\frac{(6.67\times 10^{-11}~N~m^2/kg^2)(5.98\times 10^{24}~kg)(2000~kg)}{6.37\times 10^6~m+4.0\times 10^5~m}$
$U = -1.18\times 10^{11}~J$
