An airplane of mass 1.70 x 10^4 kg is moving at 62.0 m/s. The pilot then increases the engine's thrust to 7.10 x 10^4 N. The

Question

An airplane of mass 1.70 x 10^4 kg is moving at 62.0 m/s. The pilot then increases the engine's thrust to 7.10 x 10^4 N. The resistive force exerted by air on the airplane has a magnitude of 5.00 x 10^4 N.
(a) Is the work done by the engine on the airplane equal to the change of the airplane's kinetic energy after it travels through some distance through the air?
Is the mechanical energy conserved? Explain your answer.
(b) Find the speed of the airplane after it has traveled 5.00 x 10^2 m. Assume that the airplane is in level flight throughout the motion.

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