This interactive sketch produces the trajectory of a projectile. It requires Geometer's Sketchpad to run. The user can specify the launch angle and velocity and launch the projectile. You can also include air drag for the projectile. The sketch shows the projectile moving on its path and calculates the components of the position and velocity as it moves along its path. This can be used as a dynamic teacher illustration or as an interactive student exploration. You must have Geometer's Sketchpad to run this illustration.