Why do some verbs add ed to become adjectives while others add ing?

Why do some verbs add ed to become adjectives while others add ing?

It's like asking why a verb is a verb, and there's no specific way to answer it. So we need to remember these words. However, some verbs can add ed and ing to form adjectives. The difference is that ing has an active meaning or more ornaments, while ed more passively modifies people