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**[SOLVED] classical mechanics marion and thornton**

**1. Homework Statement**

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. Homework Equations**

**3. The Attempt at a Solution**