Which of the following tools is categorized as a type of hammer?

A sledge is correctly categorized as a type of hammer because it is specifically designed to deliver a heavy blow to objects, often used in construction and demolition. Sledgehammers have a large, heavy head and a long handle, allowing for greater force to be applied than with lighter hammers. This makes them suitable for tasks such as driving stakes into the ground or breaking apart materials.

In contrast, a wrench is a tool used for gripping and turning objects, typically nuts and bolts. Pliers are designed for gripping, bending, and cutting, and can often manipulate small parts but do not deliver impacts like a hammer. A saw is a cutting tool, used for slicing through materials, and is not designed to apply force through impact. Thus, while each of these tools serves a distinct purpose, the sledge stands out as a true hammer.