On the highway there are many different types of crash barriers. The greater the

Question

On the highway there are many different types of crash barriers. The greater the force on our bodies, the more injury we will sustain. Which of the barriers provides the greatest likelihood of surviving a crash at 35 mi/hr? A) A cement wall that stops your vehicle in .16 s B) A springy steel guard rail that will absorb the impact then propel you backwards at 5 mi/hr. The total time for the impact and rebound is 0.28 s. C) A series of water-filled barriers that stops your car in 0.26 s. D) A two stage barrier that slows your car from 35 mi/hr to 20 mi/hr in 0.13 and then stops the car completely in another 0.12s (hint, look at the two steps individually)

Explanation / Answer

D) A two stage barrier that slows your car from 35 mi/hr to 20 mi/hr in 0.13 and then stops the car completely in another 0.12s

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