A 14.0-m uniform ladder weighing 520 N rests against a frictionless wall. The ladder makes a 57.0° angle with the horizontal. (a) Find the horizontal and vertical forces the ground exerts on the base of the ladder when an 830-N firefighter has climbed 4.20 m along the ladder from the bottom. Horizontal Force magnitude direction towards the wall Vertical Force magnitude direction N N up (b) If the ladder is just on the verge of slipping when the firefighter is 9.20 m from the bottom, what is the coefficient of static friction between ladder and ground? Need Help? Read It Master It