Find the least value of P required to cause the system of blocks shown to have impending motion to the left. The coefficient of friction under each block is 0.20. P α 50kN 15kN 30%

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Q: Please can you show which formula did you use on step 1? How did you proceed?

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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?”