1. The problem statement, all variables and given/known data Build an elastic-powered or gravitational-powered car that traverses on sand for 2 meters, then fires a projectile perpendicular to the car into a target 2 meters away. The car + projectile is marked based on: Distance traveled before firing (as close as possible to 2 meters) Firing accuracy Weight of car (1 kg / (1 + mass)) The car must fit within 20 centimeters in both length and width of the dock -It doesn't have to stop before firing 2. Relevant equations -None really 3. The attempt at a solution The current car I have built is only a base, but it refuses to run on sand at all. -I used retractable badge clips as the source of elastic energy, instead of rubber bands. The car runs perfectly fine on solid ground, but the sand is so fine that it resists all initial movement by the car so it simply can't build any momentum. Even after modification and adding on a total of 3 retractable badge clips the car still can't muster enough power to begin running. Any suggestions or advice would be highly appreciated!