This is an EJS 4 generated simulation to illustrate projectile motion.

Vi is the initial speed when the firework were shot from the ground.
Vf is the velocity relative to the center of mass when it spread out.

[b]Do you know why the sound is delayed? [/b]
Will you be able to find out the distance between you and the place where the firework were fired from the delay of the sound?
Do not forget to [b]TURN your speaker volume UP[/b] to hear sound effects.

DOWNLOAD ejs xml source
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.