The particles in a solid don't really *go* in the way you might think of a car or a ball going. Instead, they vibrate in place.

Here's a breakdown:

* Not Free Movement: Unlike liquids and gases, particles in a solid are tightly packed and held together by strong forces. They can't move freely around like in a liquid or gas.

* Vibrations: They do, however, vibrate in place, like a tiny spring. These vibrations are constantly happening.

* Temperature and Speed: The faster the vibrations, the higher the temperature of the solid. So, while they don't move around a lot, their speed is related to how hot the solid is.

* No Single Speed: It's important to note that the vibrations of individual particles are not all at the same speed. They have a range of speeds and are constantly changing.

So, while we can't talk about the speed of a solid particle in the same way we talk about the speed of a car, we can say that the particles are constantly vibrating, and the speed of these vibrations increases with temperature.