Distinguish between stable, unstable, and neutral equilibrium in flight. (Identify the statement that correctly describes unstable equilibrium.)

• A. Stable: returns to the original state after a disturbance.
• B. Unstable: returns to the original state after a disturbance.
• C. Neutral: remains exactly in the new displaced state after a disturbance.
• D. All equilibrium types are identical in response to disturbances.

Answer: (B)