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You push with a horizontal force of 48.0 against a 23.0 box, pressing it against a rough wall to hold it in place. The coefficients of kinetic and static friction between this box and the wall are 0.200 and 0.500, respectively.

Part A What is the friction force on the box?

Part B How hard would you have to press for the box to slide downward with a uniform speed of 9.00?

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