Two boxes are connected by a massless string across a massless frictionless pulley.  Box S has a mass M and box H has a mass m. write Newton's 2nd law equation for these objects, horizontal component only for box S and vertical component only for box H. solve algebraically for acceleration of the boxes. given M = 8.4 kg and m = 5.7 kg, use the equation from the previous part to find the value of the acceleration. use this answer to find the tension of the string

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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?”