How do you make a mousetrap car also using CO2?

first you buy a mouse trap, then you find old toy car wheels. next you fashon the wheels so they spin, then you take off the metal ontop of the trap, and place there a co2 can. then you tape it down and slightly open the cap. LET IT GO My brother just made a CO2 car in his woodshop class, then he just attached it to his car, and he got alot of distance.