you need to go the long way around.... Build a ramp over the top of the yellow piece (and lock it in place so it doesnt topple over) and then a second ramp all the way from the right side, back over to the left side, that way you have more length to build up speed. I got it solved.
If you get stumped, here's the link, but DONT CLICK IT if you dont want to see my solve:
http://fantasticcontraption.com/?designId=9732746