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A person driving a car suddenly applies ...

A person driving a car suddenly applies the brakes on seeing a child on the road ahead . If he is not wearing seat belt, he falls forward and hits his head against the steering weel. Why ?

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When a person driving a car suddenly applies the brakes , the lower part of the body slower down with the car while upper part continues to move forward due to inertia of motion.
If driver is not wearing seat belt , then he fails forward and his head hit against the steering wheel.
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