Two blocks, with masses 4.00 kg and 8.00 kg, are connected by a string and slide down a 30.0o inclined plane (Figure 1). The coefficient of kinetic friction between the 4.00 kg block and the plane is 0.250; that between the 8.00 kg block and the plane is 0.350. (A) Calculate the acceleration of the smaller block. (Express your answer with the appropriate units.) (B) Calculate the acceleration of the larger block. (Express your answer with the appropriate units.) (C) Calculate the tension in the string. (Express your answer with the appropriate units.)

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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?”