A setup of two block system is shown in Figure 3 below. Block B weighs 712 N rests on top of a table whose coefficient of static friction between block B and the table is 0.25. What is the minimum weight that block A must have so that block B will remain at rest?  a. 200 N b. 180 N c. 170 N d. 155 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?”