A 4500 lb SUV is traveling at 65 mph when it strikes a stagedattenuator designed to produce three different energy dissipationrates. For the first 6 ft, the attenuator produces a force of20,000 lb on the impacting vehicle. The second stage is 4 ft longand produces a deceleration force of 40,000 lb. “How long does theattenuator’s 3rd stage have to be to safely stop the SUV if itsdeceleration force is 60,000 lb. Construct the a-s, a-t, and v-tcurves for this impact. (Hint: safely stopping the SUV means thevehicle stops before using up the 3rd stage.)
