An airplane is traveling in level flight at a constant velocity. L is the lift, W is the weight, T is the thrust, and D is the drag. Which of the diagrams is the correct free body force diagram for the airplane? Figure 1 Figure 4 W Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 2 Figure 5 fon L Figure 3

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”