Rocket Problem

[Moerangi]

Hi,

I need to calculate the gravitational potential energy of a rocket that's 500km above the surface of Earth (rocket has a mass of 500kg).

What formula would I use, and how would I calculate it?

Any help is appreciated,
Thanks.

[BishopUser]

Gravitational potential energy is typically represented by U_g=-G\frac {m_1m_2} {r} when things are high above the earth's surface.