(Summary description)The last car of the roller coaster is the most exciting gift the roller coaster presents to brave passengers. In fact, the feeling of descent is most intense in the tail car of the roller coaster. Because the last car passes the highest point faster than the car at the head of the roller coaster, this is due to gravity acting on the center of mass in the middle of the roller coaster. In this way, the person in the last carriage can quickly reach and cross the highest point, which will produce a feeling of being thrown away, because the center of mass is accelerating. The wheels of the tail car are firmly buckled on the track, otherwise the small car may derail and fly out when it reaches the peak.