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Seatbelts have a vital role for our motorists... it prevents people from being throwed into the dashboard in case there's a great impact... thus seatbelt law helps to save lives...
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Newton's First Law of Motion (aka Law of Inertia)
When you suddenly stop (in a car), inertia will cause your body to move forward. Seat belt helps you to not be thrown by that force of inertia.
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