A block of mass m lies on a surface that has static and kinetic friction coefficients between the block and the surface are Xe and Xc. The block is initially at rest and a horizontal force F is applied to it. a) Calculate the resultant force on the block if F = 45 N. b) Calculate the minimum value of the magnitude of F, from which the block will move. c) If a force F = 80 N is applied on the block for a time t = 4 s, calculate the horizontal distance that the block travels until it stops.

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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?”