Answer:
In a car accident, a
fast running car stops suddenly. Due to this the car's large momentum is
reduced to zero in a very short time. The stretchable seat belts tightened by
the passengers of the car increases time taken by the passengers to fall
forward. Due to longer time, the rate change of momentum of passengers is
reduced and hence less stopping force acts on them. So, the passengers may
either not get injured at all or may get less injuries. It is obvious that seat
belts reduce the passengers' momentum more gently and hence prevent injuries.
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