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This is a past paper question, 3 marks.
if you use the equation FORCE ACTING(N)=CHANGE IN MOMENTUM(KG M/S)/TIME TAKEN FOR CHANGING TO HAPPEN(S) seat belts increases the time taken. this reduces the forces acting on the chest
this is correct, seat belts bacically increase the time for you to come to a stop, this therefore allows less force/energy to act on you as it is spread over a greater time.