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## Homework Statement

A force is applied to a 3.5 kg radio-controlled model car parallel to the x-axis as it moves along a straight track. The x-component of the force varies with the x-coordinate of the car as shown in figure .Suppose the model car is initially at rest at x=0 and vector F is the net force acting on it.

Use the work-energy theorem to find the speed of the car at x=3.0m

## Homework Equations

[tex]W_{tot} = \frac{1}{2}mv_{f}^{2}-\frac{1}{2}mv_{i}^{2}[/tex]

[tex]F = ma[/tex]

## The Attempt at a Solution

At x=3 is the force 0 or 2? I have no clue how to approach this one.