If the displacement of a particle is zero, it means that the particle has returned to its starting point.

Here's why:

* Displacement is the change in position of an object. It is a vector quantity, meaning it has both magnitude (distance) and direction.

* Zero displacement implies that the final position of the particle is the same as its initial position.

Example:

Imagine a person walking 5 meters east, then 5 meters west. The total distance travelled is 10 meters, but the displacement is zero because they end up back where they started.

Important Note:

* Zero displacement doesn't mean the particle hasn't moved at all. It just means it ended up back at its starting point.

* The distance traveled can be non-zero even if the displacement is zero.

Let me know if you have any other questions!