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## Homework Statement

A commercial claims that a car can stop on a dime (17.9mm). If a car is initially traveling at 13.4m/s, what acceleration would the car experience coming to a stop in that short distance?

## Homework Equations

avg acceleration

Coversion

## The Attempt at a Solution

I recognize that the acceleration may be negative since the car is coming to a stop. So i kept that in mind as I tried solving.

I first converted 17.9mm to m and got 0.179m.

I then tried to draw it out and label values.

- Initial velocity: 13.4m/s
- Acceleration: ?
- Displacement: 0.179m
- I'm assuming that the final velocity is 0m/s since its coming to a stop.

The question is also multiple choice.

A) -5m/s^2

B) 250m/s^2

C) 10m/s^2

D) -5000m/s^2

E) 240m/s^2

So I'm thinking that the answer maybe either be A or D. I'm just not sure what steps to take next to get to either conclusion.