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BDifficulty 2/5

Under comparable conditions, when collision impact speed increases, what usually happens to injury severity?

Correct answer

Injury severity usually increases.

It usually increases. Speed affects both crash risk and impact energy, but actual injury also depends on other factors. This does not mean every faster collision causes the same injury or automatically causes loss of coordination. Speed does not itself shorten human reaction time; with equal reaction time, more distance is covered before braking begins.

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  • Human reaction time necessarily decreases.

  • Injury severity usually increases.

  • All coordination of movements is automatically lost.

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