A platform supported by three ropes (shown in Figure P6-9) has a mass of 204 kg and carries a load of 4 kN. Calculate the tension in each rope. A B 71.3 m .3 m .7 m .7 m .7 m 1 m 4 KN .3 m FIGURE P6-9

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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?”