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What is the speed of the aircraft relative to the ground called as?

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What is the speed of the aircraft relative to the ground called as?

(a) Relative speed

(b) Inertial speed

(c) Ground speed

(d) True airspeed

This question was addressed to me during a job interview.

Asked question is from Air Data Equations topic in section Air Data Systems, Altitude and Heading Reference of Avionics

1 Answer

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Correct choice is (c) Ground speed

Explanation: When you stand on the ground with a radar speed gun pointing at the aircraft, the speed measured is called the ground speed and is measured relative to the ground. True airspeed is measured relative to the wind.

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