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Jaccobtw
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- Homework Statement
- I'm reading my text book about the gravitational potential energy of a satellite-star system. It says 'The mechanical energy of a star-satellite system can be negative because gpe is always negative when we let the gpe be zero at infinite separation.
- Relevant Equations
- None
It sounds like the book is contradicting itself or I just don't understand something fundamental. How can energy be negative? Thank you