A huge cannon is assembled on an airless planet. The planet has aradius of 5.0 \times 10^{6}\;{\rm m} and amass of 2.6 \times 10^{24}\;{\rm kg}. Thecannon fires a projectile straight up at 4500 m/s.
What height does the projectile reach above the surface?
An observation satellite orbits the planet at a height of1000 km. What is the projectile's speed as it passesthe satellite?


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