How many knots of airspeed above 125 KIAS can be traded for an increase of approximately 100 feet in altitude?

Trading airspeed for altitude involves understanding the aircraft's performance characteristics and the relationship between kinetic energy (airspeed) and potential energy (altitude). In the case of the T-6B, it is commonly accepted that for every 10 knots of airspeed above 125 KIAS, you can gain approximately 100 feet in altitude. This is influenced by the aircraft's specific lift-to-drag ratio, power available, and the effective use of climbing techniques.

When you trade airspeed for altitude, you are essentially converting the extra kinetic energy present in the increased airspeed into potential energy, resulting in the plane climbing in altitude.

Since the correct choice indicates that you can trade 10 knots of airspeed for an increase of about 100 feet in altitude, it aligns with fundamental principles of aerodynamics and the operational characteristics of the T-6B aircraft. Thus, a trade of 10 knots results in a practical and effective climb performance.