As shown below, the mass of block 1 is m1 = 4.0 kg, while the mass of block 2 is m2 = 7.0 kg. The coefficient of friction between m1 and the inclined surface is μk = 0.49. What is the acceleration of the system? (Enter the magnitude in m/s2.)

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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?”