Preparation: Speed/Average/Explain It/(Distance/Time).
The applet is on Page 2. Instructions on how to use the applet and a lesson on average speed and average velocity are available from the applet's Help menu under Applet Help. At the beginning of the lesson, there is a useful listing of relevant notation and definitions.
The applet lets you drag a ball, and it displays the ball's average speed and average velocity during the dragging process and quantities needed to calculate the average speed and average velocity.