#### Problem 22E

22. A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is $1 \mathrm{~m}$ higher than the bow of the boat. If the rope is pulled in at a rate of $1 \mathrm{~m} / \mathrm{s}$, how fast is the boat approaching the dock when it is $8 \mathrm{~m}$ from the dock?