A student pulls a box on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box is 40.0 kg. Draw the free-body diagram for the box. Use g = 9.8 m/s2.  Calculate the acceleration of the box. What is the normal force acting on the box

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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?”