OK...in my physics class i have to make a vehicle that is powered by a 1_kg mass falling a maximum of .5 meters.
1. No prefabricated wheels
2. No electric, animal, or commercially availiable motors
3. Not from a kit (home made)
4. Internal Propulsion (no pushing, kicking etc.)
5. max size 24''x 12''
Any suggestions would be great, i kinow all u intelligent people out there can think of something. Remember, less friction and inertia the farther it will go.