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## Homework Statement

A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for 3.2 km in 3.5 minutes. How fast in m/s is the car moving after this time?

## Homework Equations

DeltaX=1/2(vi+vf)(DeltaT)

Displacement=1/2(initial velocity + final velocity)(Time interval)

## The Attempt at a Solution

3.2=1/2(6.4+x)(3.5)

x=-4.6

? Why is this negative? What is the final velocity?