A $3.5-\mathrm{m}$ Ladder Is Leaning Against the Side of a Building $0.80 \mathrm{~m}$

Short Answer

A $3.5-\mathrm{m}$ ladder is leaning against the side of a building. At what rate is the top of the ladder sliding down the building if the bottom of the ladder is $0.80 \mathrm{~m}$ from the base of the building and being pulled away from the building at $2.0 \mathrm{~m} / \mathrm{s}$ ?