Consider an automobile accident in which a 1000 kg car strikes a tree in an inelastic collision.  The speed of  the car just before the collision was 72 km/hr.  The duration of the impulse is 0.01s.  What force does the passenger experience? In the same automobile, a passenger of mass 50 kg is sitting, unrestrained, in the front seat.  The speed of the passenger was 72 km/hr before the collision and zero afterewards.  The duration of the impulse that changes is or her momentum is again 0.01 s.  What force does the passenger experience? Same automobile accident, except that the passenger is restrained by a seat belt and an air bag explodes at the moment of impact.  The passenger's speed still changes from 72 km/hr to zero, but the air bag slows the time during which this change occurs to 0.01 s.   What force does the passenger experience?

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