In this project the goal was to build a vehicle that used alternative energy. For this project we had many choices to pick from such as rubber bands, springs, mouse traps, or solar power. My group and I chose to use a spring and a string. We attached the string to the axle and then attached the spring to that. We attached blocks the the wheels so that we can twist the wheels to pull back the spring. At first the wheels spin to fast so we added weight to the back to actually give it more friction on the ground. The news skills I learned in this project was to be more frugal. I learned to work with what I had available. Although our car was not the prettiest it worked the best. During our presentation our car got the closest to the goal which was five meters. Our presentation of our car went very well and the car was a success.We definitely had trouble building and repairing our car. During the build we had a set design and how far the actually pull back the spring. But the wood in the axle split and we tried to re[air it and it wasn't actually as good as the first one. And as we stretched the spring as expected it it slowly lost its elasticity.