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A Jet Airplane Flies at a Constant Velocity Through the Air

Question 78

Multiple Choice

A jet airplane flies at a constant velocity through the air. Its jet engines exert a constant force forward on the plane that exactly balances the force of air friction exerted backward on the plane. These forces are equal in magnitude and opposite in direction. Do we know this because of Newton's second law or Newton's third law?


A) Newton's second law
B) Newton's third law
C) Both laws
D) Neither (explain)

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