Answer Happy

2.1% Perhaps you have seen those yellow barrels near a highway underpass designed to prevent death in the event of a car crash? It is my understanding they are called sand barrel arrays. To get a feeling for how these might work, let's assume the barrels cause a constant acceleration even though the acceleration actually changes quite a bit during the collisions. Assume a car comes in at 80 mph and stops in a distance of 9.00 m. 35.0 S a) Determine the time to stop. b) Determine the acceleration in using the coordinate system shown. c) For comparison, assume no yellow barrels were present. If you hit the concrete you would come to a full stop in perhaps 1.5 m...approximately the distance between your face and the concrete structure at the moment your bumper impacts the concrete. Compute the acceleration for this case. d) People like to use g's when discussing acceleration. Convert your accelerations from the previous parts to g's by dividing each term by g. Example: a = 8.25 implies = 0.842 implies a = 0.842g. Notice you don't have to include units when describing accelerations in terms of g's (because the units are hidden inside... g = 9.8).