A 100-N box rest on top of 45° inclined plane. The box is connected to a hanging object of unknown weight via a flexible cord that passes over a frictionless pulley.The coefficient of kinetic friction (?k) between the incline and the box is 0.15. Find the weight of the hanging object so that the box will slide up the incline at a constant speed after it is set in motion?

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Q: friction

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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?”