Go-Karts

In science class, we are making go-karts.  We can only make them using cardboard, rubber bands, and tape, with a few other wooden things like wheels and stuff.  And the really cool part is.... I'm in a group with Gage, Will, and this other kid named Ethan who is really nice too!  I can't believe my luck!  So anyway, we came up with this basic design plan that is easy and hopefully- efficient.  The hard part about the whole thing though, is that we can't start it with a catapult like to to get it going.  Also there is no ramp we can make it go on.  Just a two meter mark that we have to pass on level ground!  I have no clue how this is going to work.