Answer :
Final Answer:
The net force on an 800-kg airplane flying with a constant velocity of 160 km/hour north is zero (d).
Explanation:
In physics, the net force on an object is the vector sum of all the individual forces acting on it. When an object is in a state of constant velocity, it means that the forces acting on it are balanced and there is no acceleration or change in its motion. This is in accordance with Newton's first law of motion, often referred to as the law of inertia.
In the given scenario, the airplane is flying with a constant velocity of 160 km/hour north. This implies that the forces causing it to move northward are exactly balanced by the forces opposing its motion. The airplane is not accelerating or decelerating; it is maintaining a steady speed and direction. Since acceleration is directly related to the net force acting on an object through Newton's second law (F = ma), the fact that the airplane's velocity is constant indicates that the net force is zero.
In essence, the airplane's weight and the air resistance it experiences are being counteracted by the thrust of its engines and other forces. These opposing forces create a balanced situation, resulting in no net force and thus no change in its velocity.
Hence, the correct answer is option (d) - zero.
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