Discussion
A stability derivative is defined as
Answer: A
A derivative is a partial rate of change: how much force or moment appears per unit change of one motion variable, with the others held at their trim values. That is what makes the linearised equations of motion possible, since each derivative is one coefficient in them. A total force is a trim quantity, not a derivative. The second time derivative of displacement is an acceleration, which the derivatives help to compute rather than being one. Lift-to-drag ratio is a performance parameter that appears in the phugoid damping estimate but is not itself a derivative.
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