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1. The problem statement, all variables and given/known data

At the beginning of section 12.4 in marion and thornton, they say that [itex]\dot{q}_k[/itex] and [itex]\ddot{q}_k[/tex] are both 0 at equilibrium, where these are generalized coordinates. Can someone please explain how they got that the latter? Actually and the former? Is that part of the definition of equilibrium? Where was that defined?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Classical mechanics marion and thornton

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