Block B in (Figure 1) rests on a surface for which the static and kinetic coefficients of friction are 0.58 and 0.40, respectively. The ropes are massless. What is the maximum mass of block A for which the system remains in static equilibrium? Express your answer with the appropriate units.

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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?”