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The first human starship entered a circular orbit about a planet similar to earth. The mass...

The first human starship entered a circular orbit about a planet similar to earth. The mass of the starship is 7.5x10^4 kg, and the energy orbital is -1.67x10^12 J. The starship orbits the planet every two and a half hours.

a) Distance between from starship to center of Planet?

b) Mass of the planet?

c) What is the minimum energy must the impulse engines provide (assumption is that they are 100% effective) so that the starship can leave the planet and commence her return to Earth?

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