The crash-test dummy in either car has the same mass and initial velocity. Once each has come to a complete stop (whether by slamming into the car dashboard, or being restrained by the airbag and seatbelt), which crash-test dummy (in the car with no seatbelt nor airbag, or in the car with a seatbelt and airbag) would have:
...a greater magnitude momentum change ∆p?Then as a result, which crash-test dummy (in the car with no seatbelt nor airbag, or in the car with a seatbelt and airbag) would have less serious injuries?
...a greater magnitude impulse J exerted on it?
...a longer stopping time ∆t? (Note that both cars have the same stopping time, but each crash-test dummy takes a different amount of time to first come to a stop by slamming into whatever is in front of it.)
...a greater magnitude net (stopping) force ΣF exerted on it?