This is a simple example for projectile motion. Change the velocity and click play to see the trace.

VIEW or DOWNLOAD ejs xml source
    Available translation (locale: translators) click link to toggle view of translation done by that user
  1. Português - Brazilian portuguese(ptbr):Rodolfo
then click to translate strings for selected locale.

Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.

Enjoy it.