Answer
When a car comes to a stop, there is an impulse exerted on the passenger to bring the passenger to a stop. If the time of the collision is shorter, then the average force on the passenger will be greater.
If a car has a crumple zone, the time of the collision increases. Then the average force exerted on the passenger decreases, and it is not as dangerous for the passenger.
Work Step by Step
When a car comes to a stop, there is an impulse exerted on the passenger to bring the passenger to a stop. If the time of the collision is shorter, then the average force on the passenger will be greater.
If a car has a crumple zone, the time of the collision increases. Then the average force exerted on the passenger decreases, and it is not as dangerous for the passenger.