A Cessna Aircraft Has A Liftoff Speed Of 120km/h

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The thrust created by a lone jet engine produces a force of F = 78000 N. It takes the aircraft (with a mass of m = 7300 kg) a distance of d = 0.71 km to take off.

A) What is the take-off speed of the aircraft vt in m/s?

B) How far in meters would you need to depress a giant spring k = 100,000 N/m in order to launch the aircraft at the same speed without help from the engine?


A) v = 123.1 m/s

B) x = 33.3 m


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