A mass of 3.38 kg is on a horizontal surface. An applied force of 22.6 N at an angle of -28.2 degrees with respect to the horizontal acts on the mass. What normal force does the surface exert on the mass? (Assume that gravity is in the system)

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Q: h2 S2 (c)

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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?”