### What is the lift force exerted on the air by rotors

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Q. A 0.35kg mass suspended from a spring moves with simple harmonic motion. At the instant mass is displaced from equilibrium by -0.105 m, what is its acceleration? (The spring constant is 11.8N/m)

Q. A 5500 kg helicopter accelerates upward at 0.50 m/s^2 while lifting a 1200 kg car.

A. what is the lift force exerted on the air by rotors?

B. what is the tension in cable (ignore its mass) that connects the car to the helicopter?

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