A box full of books rests on a wooden floor. The normal force the floor exerts on the box is 317 N. A) The multiple choice B) If you must push horizontally on the box with a force of at least 150 N to start it sliding, what is the coefficient of static friction? C) Once the box is sliding, you only have to push with a force of 120 N to keep it sliding at constant speed. What is the coefficient of kinetic friction?

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