The jet is traveling at a speed of 720 km/h. If the fuel is being spent at 0.8 kg/s, and the engine takes in air at 200 kg/s, whereas the exhaust gas (air and fuel) has a relative speed of 12,000 m/s, determine the acceleration of the plane at this instant. The drag resistance of the air is F_D = (55 v²), where the speed is measured in m/s. The jet has a mass of 7 Mg.

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720 km/h