Your answer is incorrect.
Suppose instead that K + Ug of the system is B. Which of the following statements are true?
When the separation between the planet and star is r2, the kinetic energy of the system is zero.
When the separation between the planet and star is r2, the potential energy of the system is zero.
The planet and star cannot get farther apart than r2.
This is not a bound system; the planet can escape.
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