The coefficient of static friction

Two vertical walls are separated by a distance of 2.5 m. Wall 1 is smooth and wall 2 is not smooth. Wall 1 is not fixed to the floor while wall 2 is.A board is placed between the two walls. The coefficient of static friction between the board and the wall 2 is 0.91 and the coefficient of static friction between wall 1 and the floor is 0.3. Wall 1 is 2m long and 0.85m wide and has a mass of 120 kg and a center of mass at its geometric center. Depending on where the board is placed, wall 1 may start to tip over before it starts to slide along the floor. What is the maximum mass of the board and the highest distance above the floor that the board can be propped on each wall so that it will not tip before it begins to slide?

READ ALSO :   shipping law