None of these is correct. A 15790 kg helicopter moves upward with a constant acceleration from rest to a height of 271 m. The spinning blades create an upward thrust of 380903 N that lifts the helicopter into the air. How long does it take the helicopter to reach the height of 271 m? Ot= 6.195 s O t = 4.627 s O t= 6.715s O t= 5.286s ONone of these is correct