The x and y axis are the x and y displacement of an object respectively. The parabola in the applet describes the path of the projectile, when it is influenced by gravity. You can see how the path changes when parameters change.[br][br]Click 'Play' to launch the projectile. Click 'Pause' to stop the projectile at it's current position, click 'Reset Projectile' to put it back to initial position ([math]s_x=0[/math])