Science Buddies: "Ask an Expert"

I have to make a propelled device for my earth science class. It can use things like rubber bands for power. The device will be sent down an 18 meter hallway with a coded message. The message will tell my partner to do something like, pick up a pencil. Then she will send the device back down the hallway with the object(pencil) attached. Its supposed to work like the Mars rover would. Pick up a sample and send it back. But my big issue is building a device to propell itself down the hallway. I would like to present my project the week of January 16, so I don't have a ton of time! Any help is appreciated!

I'm not clear on all the requirements you may have, but this URL might be of help?

http://pbskids.org/designsquad/parentse ... d_car.html

Good luck!