Brain Storming!
Ideas 1: Drag the can back using:
1.Claws! (Rawr!)
First the can will be grabbed up slightly by the "claws"! Then while dragging the can, the 'car' moves back to the starting point!
2.Strings/ Wires !
Using the same theory as the "claws", but instead we will be using metal wires to loops over the can and drag it back instead!
Ideas 2: Hit the can with so much power (from the spring or rubber band!) that it will slide all the way to the finish line! *poing!* launch
First, the rubber band will be stretch backwards.
And when the rubber band have been pulled back enough, the hook that is pulling the rubber band back will release the band, and the band will 'launch' the can forward towards the finishing line!
If you cant see the pictures clearly, click on the link at the side bar!
SPONGEBOB SQUAREPANTS!