Suppose an object with mass, m, is suspended from a cable. Which statement about Tension is true? Provide explanation   A. Tension in the cord while the object is at rest is the same only when the object is moving at a constant velocity upward. B. Tension in the cord while the object is at rest is greater when the object is moving at a constant velocity upward. C. Tension in the cord while the object is at rest is the same when the object is either moving at a constant velocity upward or downward. D. Tension in the cord while the object is at rest is the same only when the object is moving at a constant velocity downward. E. Tension in the cord while the object is at rest is greater when the object is moving at a constant velocity downward

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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?”