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What is the function of excess thrust in longitudinal equations of motion?

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What is the function of excess thrust in longitudinal equations of motion?

(a) Decrease the potential energy and kinetic energy

(b) Increase the potential energy and kinetic energy

(c) Decrease the potential energy and increase kinetic energy

(d) Increase the potential energy and decrease kinetic energy

I have been asked this question during an interview for a job.

The query is from Equations of Motion for Performance topic in division Aircraft Force Systems and the Equations of Motion of Aircraft Performance

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The correct answer is (b) Increase the potential energy and kinetic energy

The best I can explain: The function of excess thrust in longitudinal equations of motion is to increase the potential energy and kinetic energy. Excess thrust in the longitudinal equations of motion is given by FN-D where FN is net thrust force and D is drag force.

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