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Introductory Physics Homework Help
Mechanical energy for planet in elliptical orbit around star
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[QUOTE="jbriggs444, post: 5993573, member: 422467"] Like you, I would have chosen answer A, including both the planet's kinetic and gravitational potential energy in the planet's "total mechanical energy". However, it appears that "mechanical energy of just the planet" is intended [B]not[/B] to include any gravitational potential energy based on the planet's position in the gravitational field of the star. The "mechanical energy of the star-planet system" does include the gravitational potential energy (-GmM/r) just as you indicate along with their kinetic energies. The total is constant and negative, as indicated by both A and C. [/QUOTE]
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Mechanical energy for planet in elliptical orbit around star
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