Please help with answering this for General Physics class concepts . I need at least a paragraph or 2 explaining .

Exam#2-2: NASCAR is an organization that runs stock car racing in the United States. It is called stock car racing because it uses cars that are manufactured for use on the road (stock), with some modifications. A few decades ago, racing teams started to make the frames and suspension on the cars less flexible, which let them drive faster. It also meant more drivers got injured when there were accidents. The barriers on the outer edge of the track have been modified to offset some of this danger. What physics principle was not considered in modifying the cars, and what might be done to make the barriers safer? For this exam question, write several sentences on what concepts do you think apply and what do you think they did to the barriers. You can include the equations apply if there are any and use that as a starting point for your discussion. (5 points)