- #1

kvkenyon

- 21

- 0

## Homework Statement

In a crash test a solid concrete wall is

used to test crashworthiness. A particular

SUV weighs 338.183 kg and is accelerated to

33.3485 m/s before colliding head on with the

barrier.

What impulse must be applied is required

to stop the SUV?

This gives Impulse = 11277.896

The struggle comes with this part:

Through structural analysis of the SUV you

ﬁnd out that 21801 N will destroy the engine

block. If we ignore the friction between the

car and the ground and assume the force the

wall exerts a constant force on the car, What

is the shortest collision time that will leave

the engine block intact?

Answer in units of s

## Homework Equations

Impulse = net force * change in time

p(f) = p(i) + Impulse

## The Attempt at a Solution

So I assumed that a force of 21800.9N force would mean that the engine

is not broken. I do not know if this assumption holds. However, it seems to make

sense in my mind. So i figured if the wall exerts a constant force of 11277.896N

causing the car to have a momentum of 0; the change in time is:

21800.9N/11277.896N --> 1.933064465s

But this is apparently wrong.