An object can be saved in one Alice world and used in another. Save the physics object with the ballistics flight method from Tutorial 10B and then develop another simple Alice world that uses it. You don't need to know anything about the internal math of the method to use it, but you do need to know that it takes an initial angle and initial velocity as its parameters. You should keep your world simple; do not try to make a character look like it is throwing something, like the athlete in Tutorial 10B does, because that could take a lot of time to implement. The Alice local object gallery has a cannon that you could use. You might create a loop or event to keep something moving, and try to hit it with an object fired from the cannon.