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Satellite In Orbit: Find the altitude and the mass

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When in orbit, a communication satellite attracts the earth with a force of 15.3 kN and the earth-satellite gravitational potential energy (relative to zero at infinite separation) is - 1.47×1011 J.

A) Find the satellite's altitude above the earth's surface.
Take the radius of the Earth to be r_e = 6.38×106 m.

B) Find the mass of the satellite.
Take the gravitational constant to be G = 6.67×10−11 N*m^2/kg^2, the mass of the Earth to be m_e = 5.97×1024 kg.

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We can treat the earth as a point mass located at the center.

The mass of the satellite is ...

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