The crash cushion for a highway barrier consists of a nest of barrels filled with an impact-absorbing material.The barrier stopping force is measured versus the vehicle penetration into the barrier. Determine the distance a car having a weight of 4000 lb will penetrate the barrier if it is originally traveling at 55 ft/s when it strikes the first barrel.

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Barrier stopping force (kip) 36 27 18 9 2 5 10 15 20 25 Vehicle penetration (ft)