That's rather ambiguous. My first thought when I read "the bouncing ball" was of the little bouncing ball which goes from one word to the next on karaoke lyric screens or on cartoons or educational videos for children. That ball is anything but "undisciplined". It is very disciplined. It bounces carefully above the word which is being spoken.
An actual physical bouncing ball is a little less disciplined, I suppose, although I'm sure a physicist would tell you that how hight and fast it bounces is probably entirely predictable. From the rest of that sentence, though, I assume they are talking about a randomly bouncing ball.
Student or Learner