Question

Why our seat belts are desinged to be strech

Answer 1

Our seat belts are designed to be stretch because if seatbelt are made according to thin person it will not fit to fat person If seatbelt are made according to fat person it will be loose to thin ones.
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Answer 2

our seat belt s are designed strech as when the vehicle are braked suddenly then our body tend to fall forward due to inertia therefore seatbelt stop it fall due to Strechness and save from accident