Tokamak Question...Impact Info?

I need to be able to detect if a Tokamak object makes a collision at or greater than a specific velocity, for the purpose of playing a one shot sound effect (spent casing sound). I'm not very keen on Tokamak past "just making it work," so I have no idea what the easiest/most effective way to do this will be.

Can anyone help me out?

The collision info bank returns, amongst other information, the relative velocity of the collision.

Have you tried any collision code/demos yet to see how they work?

No I haven't...physics engines aren't my strong point, took me forever to figure out how to just get it running in my engine.

Could you point me to some examples that would be helpful then?