A) Write an expression for the component of net force, Fnetx, in the x-direction, in terms of the variables given in the problem statement.  Fnetx=   Part (c) Write an expression for the magnitude of the normal force, F, acting on the block, in terms of F2, g, and the other variables of the problem. assume that the surface it rests on is ridged     Part (d) Find the block's acceleration in the x-direction, ax, in meters per second squared.

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A: please see the image .

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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?”