Is the verbal in this sentence a gerund or participle People may become dizzy after spinning around?

The verbal in the sentence "People may become dizzy after spinning around" is a participle. Here's why:

* Participle: "spinning" is acting as an adjective modifying the noun "around." It describes the type of spinning that causes dizziness.

* Gerund: A gerund would function as a noun. We don't have a noun phrase like "spinning around is fun" in this sentence.

In summary: The word "spinning" is modifying "around," making it a participle.