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Why are car seat-belts designed to stret...

Why are car seat-belts designed to stretch somewhat in a collision ?

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The converyor belt is designed to transport packges of verious weights.Each 10 kg package has a coefficient of kinetic friction mu_(k) = 0.15 .If the speed of the conveyor belt is 5 m//s and then it suddenly stops, determine the distance the package will slide before coming to rest (g = 9.8 m//s^(2))

The converyor belt is designed to transport packges of verious weights.Each 10 kg package has a coefficient of kinetic friction mu_(k) = 0.15 .If the speed of the conveyor belt is 5 m//s and then it suddenly stops, determine the distance the package will slide before coming to rest (g = 9.8 m//s^(2))