Problem 9. A uniform ladder of length L and mass m1 rests against a frictionless wall. The ladder makes an angle 0 with the horizontal. (a) Find the horizontal and

vertical forces the ground exerts on the base of the ladder when a firefighter of mass m2 is a distance x from the bottom. (b) If the ladder is just on the verge of slipping when the firefighter is a distance s from the bottom, what is the coefficient of static friction between the ladder and the ground?