A helicopter takes off along the vertical with an acceleration a = 3 m s -2 and zero initial velocity. In a certain time ti, the pilot switches off the engine. At the point of take-off, the sound dies away in time t 2 = 30 s. Determine the velocity v of the helicopter (in m s -1 ) at the moment when its engine is switched off, assuming that the velocity c of sound is 320 m s -1 .
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