Carts A and B in Figure 1 have 5 kg and 10 kg masses, respectively. A force of F = 50 N is applied to cart B. What is the tension force acting in the string between the carts?

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A: T1 = 1830 N T2 = 1295 N ∆y = 5 m , in downwards direction FG = 2500 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?”