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11NEPHILEM11

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## Homework Statement

A car level on ground, starting from 15m/s, decelerates uniformly to rest in 20 seconds. What distance does the car cover while decelerating?

## Homework Equations

Vf = Vi+at

Vf^2=Vi^2+2aX

X=Vit+(1/2)at^2

X = Distance

Vf = Final velocity

Vi = Initial velocity

a = acceleration

t = time

## The Attempt at a Solution

I started with the X=Vit+(1/2)at^2 formula and attempted to plug in the numbers but I have no idea how to find acceleration. I mean, I know acceleration is Δv over Δt but how am I supposed to find the final velocity when I need the acceleration to plug in the formula? I'll admit I zoned out a little in my last class because I was tired from work the day before.