Question

how do safety belts prevent injury?
they allow passengers to slow down with the compartment.
they hold the passenger in place in violent maneuvers.
they prevent ejection in a crash.
all of the above

Explanation:

Safety belts work in multiple ways. When there is a sudden stop (like in a crash), without a belt, passengers would keep moving forward due to inertia. A safety belt allows passengers to slow down with the compartment (by exerting a force on them to decelerate). In violent maneuvers (sharp turns, sudden accelerations/decelerations), it holds the passenger in place so they don't hit the interior of the vehicle. And in a crash, it prevents ejection (being thrown out of the vehicle) which is a major cause of severe injury or death.

Answer:

all of the above