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Which of the following are the correct equations for take-off run?

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Which of the following are the correct equations for take-off run?

(a) FN+D-WsinγR-μrR=mV̇

(b) R-L=WcosγR

(c) R-L=WsinγR

(d) FN-D-WsinγR-μrR=mV̇

The question was posed to me in an interview.

The origin of the question is Estimation of Take-off Distances topic in chapter Take-off and Landing Performance of Aircraft Performance

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The correct answer is (d) FN-D-WsinγR-μrR=mV̇

Best explanation: The equations derived for the take-off run are as follows:

FN-D-WsinγR-μrR=mV̇

R+L=WcosγR

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