physics help?

[Nancy L]

Seat belts and air bags save lives by reducing forces exerted on driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in front of car. In event of an impact, passenger compartment decelerates over distance of about 1 m as front of car crumples. occupant restrained by seat belts and air bags decelerates with car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed Newton's 1st law. until hitting dashboard or windshield. These are unyielding surfaces, and unfortunate occupant then decelerates over a distance of only about 5mm.
a)A 65kg person is in a head-on collision. The car's speed at impact is 11m/s. Estimate net force on person if he or she is wearing a seat belt and if the air bag deploys.
b)Estimate net force that ultimately stops person if he or she is not restrained by a seat belt or air bag.
c)How do force in part A compare to person's weight?
d)How do the force in part B compare to the person’s weight?