Acceleration of Charge in a Potential Gradient

[mitchellhewer]

Homework Statement

A dust particle with mass of 0.043g and a charge of 2.0 * 10^(-6)C is in a region of space where the potential is given by V(x) = (2.0V/m^2)x^2 - (3.0V/m^3)x^3. If the particle starts at x = 2.1m, what is the initial acceleration of the charge? Your explanation will be extremely helpful. Thank you for taking the time to look at this question.

Homework Equations

Vba = (Ub-Ua)/q
dU = qVba
Vba = Vb - Va

V = (1/(4pieo))*(Q/r)

The Attempt at a Solution

I don't even know where to begin with this question.

 

[6Stang7]

Where is your attempt at solving the problem? What about relevant equations?