The boat was pulled to the dock by the bow rope through a ring on the dock.

A small boat was pulled to a dock and tied to the dock with a rope from the bow.

When the rope of 10 feet is untied, what is the speed of the ship approaching the dock?

How fast should the ship approach the dock before the rope of 10 feet breaks?

So what is the rate of angle change (see figure)?

So at what speed does the angle change? (see photo)