In a repair shop a truck engine that has mass 425 kg is held in place by four light cables (Figure 1). Cable A is horizontal, cables B and D are vertical, and cable C makes an angle of 37.1 with a vertical wall. Tension in cable A is 721 N. What is the tension in cable b? What is the tension in cable c?

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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?”