Bumper Car A (87.1 kg) moves at 5.20 m/s left before colliding elastically with Car B (68.8 kg), which was initially moving 3.80 m/s right. After the collision, Car B moves to the left at 6.26 m/s. Find the velocity of Car A after the collision. Then, verify your answer by calculating the total kinetic energy before and after the collision.