A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 810-kg helicopter rises from rest to a speed of 7.0 m/s in a time of 3.5 s. During this time it climbs to a height of 8.2 m. What is the average power generated by the lifting force? M = 810 kg V0 = 0 m/s Vf = 7 m/s t = 3.5 s y = 8.2 m Force acting on helicopter: mg and FL (the lifting force) It is accelerating upward. Find acceleration, a: Vf = Vo + at a = (Vf - Vo)/t a = 2 m/s2 FL - mg = ma FL = mg + ma FL = 810(9.8+2) FL = 9558 N P = FL x avg V = 9558 N x 3.5 m/s P = 33453 watts?