An 18.1 kg person climbs up a uniform ladder with negligible mass. The upper end of the ladder rests on a frictionless wall. The bottom of the ladder rests on a floor with a rough surface where the coefficient of static friction is 0.26. The angle between the horizontal and the ladder is θ. The person wants to climb up the ladder a distance of 1.8 m along the ladder from the ladder’s foot What is the minimum angle θmin (between the horizontal and the ladder) so that the person can reach a distance of 1.8 m without having the ladder slip? The acceleration of gravity is 9.8 m/s 2 . Answer in units of ◦