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OpenStudy (anonymous):

A helicopter of mass m is taking off vertically. The only forces acting on it are the earth's gravitational force and the force, F air , of the air pushing up on the propeller blades. (a) If the helicopter lifts off at t=0, what is its vertical speed at time t. (b) Plug numbers into your equation from part a, using m=2300 kg, F air =27000 N, and t=4.0 s

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