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## Homework Statement

A car starts at rest and accelerates in 4 seconds to a speed of 20 m/s, which it maintains for the next 8 seconds. Find the total distance travelled.

## Homework Equations

d= vi*t +1/2 at^2

d= Vavg*t = Vf+Vi/2 *t

## The Attempt at a Solution

The total time is 12seconds right?

vi=0

vf=20m/s

I can't figure this one out...please help?