Probably not, because you could not reasonably expect the table tennis ball to lead to injury. But if we change it to a basketball ball, I would again expect yo

Probably not, because you could not reasonably expect the table tennis ball to lead to injury. But if we change it to a basketball ball, I would again expect you would be punished, though not with jailtime. And of course things depend on the height of balcony, whether the accused seems regretful or thinks he did nothing wrong, etc. And being held responsible for the medical costs is probably enough of a punishment.