A 13-m long ladder is leaning against a wall. The bottom of the ladder is pulled along the ground, away from
Question:
A 13-m long ladder is leaning against a wall. The bottom of the ladder is pulled along the ground, away from
the wall, at the rate of $2 \mathrm{~m} / \mathrm{s}$. How fast is its height on the wall decreasing when the foot of the ladder is $5 \mathrm{~m}$ away from the wall?
Solution:
