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**Ap physics friction force please help!!!!**

## Homework Statement

A 1000kg car traveling at a speed of 40m/s skids to a halt on wet concrete where the friction force is 6000N. How far does the car slide before coming to a stop?

## Homework Equations

F=mv^2 / r

1000 kg x (40 m/s^2) / r = 6000 N

I got 266.7

## The Attempt at a Solution

I came up with a positive number and it should be a negative number... What am I doing wrong?!