Final answer:
Planing hulls are used in fast-moving boats such as speedboats, jet skis, and military vessels like destroyers to reduce drag and allow for higher speeds.
Step-by-step explanation:
Planning hulls are commonly found in various types of fast-moving boats and watercraft that are designed to rise up and glide on top of the water when enough speed is achieved. These include recreational boats such as speedboats and personal watercraft like jet skis, as well as in specialized vessels like racing boats and some military crafts including destroyers and high-speed patrol boats. A planning hull is designed to lift the boat out of the water as it accelerates, reducing drag and allowing for higher speeds.