4. A uniform ladder 10.0 m long and weighing 50.0 N rests against a smooth wall (No smooth wall means that there is no frictional force between the tadder and the wall) shown in the figure below. If the coefficient of static friction between the ladder an ground is 0.360 and the ladder makes a 60.0" angle with respect to the horizontal, h along the length of the ladder can a 70.0-ke painter climb before the ladder starts in (a) 6.13 m (b) 5.24 ru (c) 2.78 m SMOOTH