How fast will the unbelted occupants still be going at impact at 55mph?

If unbelted occupants are in a vehicle traveling at 55 mph and the vehicle comes to a sudden stop upon impact, they will continue moving forward at that same speed (55 mph) due to inertia until they are stopped by another object, such as the dashboard or windshield. This means that at the moment of impact, unbelted occupants can experience severe injuries or fatalities due to the high speed at which they collide with the interior of the vehicle. Seat belts are crucial for preventing such dangerous outcomes by restraining occupants and reducing the risk of ejection and impact injuries.