A box is pushed to the right at an angle f30° above the horizontal with a force of 200 N. The mass of the box is m = 20.0 kg and is moving on a flat horizontal surface for which the coefficient of kinetic friction is 0.40, Draw the free body diagram of the box. Calculate the magnitude of the normal force Calculate the magnitude of the acceleration of 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?”