Why are the car seat belt designed to stretch somewhat in a collision
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Because when seat belt is being hard or tight then its effectively affect on our stomach, and stomach can't able to absorb or take hard seat belt .
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Seat belts stop you tumbling around inside the car if there is a collision. However, they are designed to stretch a bit in a collision. This increases the time taken for the body's momentum to reach zero, and so reduces the forces on it.
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