BBscience

For a high school physics competition I need to build a cart that is powered by a 1kg hook weight that will be dropped from 1m above the ground. This is a distance competition. The course will be flat. There is no limit to the size of the cart but it needs to fit in a 6ft wide course. The organizers will give me the weight and I can attatch it anyway I want as long as it fits the above decription. Also, no vaults or ramps are allowed. Any help you can give me will be greatly appreciated.