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## Homework Statement

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

## Homework Equations

Vav= V1 + V2 divided by 2

Vf= V1 + at

Vf(sq)= v1(sq) + 2ad

## 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.