The ladder is released from the position shown with the angle given as 45o. Assume the wall is smooth but the coefficient of friction with the floor is 0.1. The mass of the ladder, m, is 16 kg and its length, L, is 2m. The mass moment of inertia, I, is as given below. What is the normal force (in N) at A at this instant?

I[kg-m2] = 12.4;

http://micko.dyndns.org/ladder_on_rough_floor.jpg