seat belts are designed to be effective in high-speed collisions by applying a backward force on the body low-speed collisions by applying a backward force on the body high-speed collisions by applying inertia on the body low-speed collisions by applying inertia on the body

Answer 1

All of the above. Seat belts are designed to protect passengers in both high-speed and low-speed collisions by applying forces such as inertia to prevent the body from moving forward and hitting the interior of the vehicle.