The jet airplane of mass M has constant speed v_j when it is flying along a horizontal straight line. Air enters the intake scoops S at rate r₁. If the engine burns fuel at the rate r₂ and the gas (air and fuel) is exhausted relative to the plane with speed v_e, determine the resultant drag force exerted on the plane by air resistance. Assume that air has a constant density ρ. Hint: Since mass both enters and exits the plane.

Given:

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Units Used: Mg = 1000 kg kN = 10³ N