When we tested the balloon car at first it went really far, but we realized that the ground was uneven. We moved to an area that had more space and less bumps. We taped the 12" balloon so that the air could escape quickly and so that the balloon wouldn't get in the car's way. The car accelerated but hit a chair, so we couldn't tell exactly how far it could go. We could tell that the car was done by how fast it was going.
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