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## Homework Statement

A 12 kg brick moves along an x axis. Its acceleration as a function of its position is shown in Fig. 7-37. What is the net work performed on the brick by the force causing the acceleration as the brick moves from x = 0 to x = 5.2 m?

http://edugen.wiley.com/edugen/courses/crs4957/art/qb/qu/c07/fig07_37.gif

## Homework Equations

W=integral from x

_{o}to x Fxdx + integral y

_{o}to y Fydy....

## The Attempt at a Solution

Since acceleration isn't constant we can't use W=Fd, so:

Statement of known values:

x

_{o}= 0 m

x=5.2 m

m=12 kg

a(5.2)=13 ms

^{-2}(from the graph.. determined by 4m/10ms

^{-2}=5.2m/x)

-----------------------

Unknown/want to find:

W

_{net}

So using the integral formula (can we assume it's only moving in the x direction?)

W=[integral]F(x)Δx

I'm at a loss though, in the example done in class, he broke the forces up in to components, but I can't really do that here since acceleration isn't constant and force is what i'm solving for...