uld ice ball decreasing at that time ! 11.21. Sliding Ladder. The top of a ladder 5 m long rests against a vertical wall. If the base of the ladder is being pulled away from the base of the wall at a rate of 0.3 m/s, how fast is the top of the ladder slipping down the wall when it is 3m above the base of the wall? 11.22. Volume. A water tank is