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During a car crash at 35 mph (15.6 m/s), your seat belt stretches by 20 cm before bringing your body to a complete stop.

During a car crash at 35 mph (15.6 m/s), your seat belt stretches by 20 cm before bringing your body to a complete stop. What is the average acceleration you experience during this crash? Express your final answer in multiples of g (= 9.8 m/s).

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