Suppose you move a 15-kg crate by pulling upward on the chain at an angle of 45 degrees above the horizontal. The crate is accelerating horizontally at 0.5 m/s^2. Assume u=0.56. What is the tension, T?   81.4 N   37.5 N   95.3 N   27.6 N

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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?”