C) Carefully consider how the accelerations a and a2 are related. Solve for the magnitude of the acceleration, a1, of the block of mass my, in meters per square second. a1= Part (d) Find the magnitude of the tension in the rope, T, in newtons. T=

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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?”