The resistance to the motion on the automobile depends on road friction, which is almost independent of its speed v, and on aerodynamic drag, which is proportional to v 2 . For a particular 12,000-N car, the total resistant force is given by f=300+1.8v 2 , where f is in newtons and v in meters per second. Calculate the power required from the motor (in hp) to accelerate the car at 0.92 m/s 2 when he speed is 80 km/h.

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