A block weighing 300 N rests on a plane inclined downward to the right at a slope of 4 vertical to 3 horizontal. The block is connected to a cable initially parallel to the plane, passing through the pulley and connected to another block weighing 100 N moving vertically downward. The coefficient of kinetic friction between the 300 N block and the inclined plane is 0.10. Compute the tension and its acceleration.

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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?”