You push with a horizontal force of 56.0 against a 25.0 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 0.300 and 0.500, respectively.
A) What is the friction force on the box?
B) How hard would you have to press for the box to slide downward with a uniform speed of 10.5 cm/s ?