Question

a ladder that has a uniform density and a mass of 25.0kg rests against a very,very slippery vertical wall.The ladder makes an angle of 60 with the ground. The lower end of the ladder rests on a flat surface where the coefficient of static friction is 0.4. A student that has a mass of 50kg attempts to climb the ladder. what fraction of the ladder will the student have reached when the ladder begins to slip