A big cannon is assembled on an airless planet. The planet consists of a radius of 5.0*10^6 m and a mass of 2.6*10^24 kg. The cannon fire a projectile straight up at around 4800 m/s.
Part I: Determine at what height does the projectile reach above the surface?
Part II: An observation satellite orbits the planet at a height of around 1000. Determine the projectile's speed as it passes the satellite?