1. The problem statement, all variables and given/known data During a car accident, a vehicle with an intial velocity of 100km/h hits a concrete wall. The "crumple zone" in the front of the vehicle is a space that makes up the engine compartment that is designed to allow the passenger compartment to continue forward a distance of 1.20m under a constant acceleration (negative) before it comes to a stop. What is the average velocity for the "crash"? Calculate the time taken to decelerate to a stop. Vi= 27.8m/s (converted from 100km/h) Vf= ? Distance= ? Acceleration= ? Time=? Required: Average Velocity, Time 2. Relevant equations Vav= V1 + V2 divided by 2 Vf= V1 + at Vf(sq)= v1(sq) + 2ad 3. The attempt at a solution I heard that you can't just take 0 as the final velocity and in that case, I have clue as to where to start this question. I need three variables to get anywhere but it looks like I only have two.