15. Cars used to be built as rigid as possible to withstand collisions. Today, though, cars are designed to have "crumple zones" that collapse upon impact. What is the advantage of this new design?
We have to explain the reason of having crumple zones in today's cars.
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For the same change in momentum of the body, smaller the value of time interval (impact time) in which this change of momentum of the body takes place, larger would be the value of the net force acting during collision and vice-versa.