Question $6($Mandatory$)(10$ points$)$

Three point charges are located along the $x$ axis as shown in the drawing; each measurement unit shown on the axis is $0\mathrm{.}1$ m $.$

The mass of the $-1\mathrm{.}2C$ charge is $4\mathrm{.}0{10}^{-9}kg.$ Determine the magnitude and direction of the acceleration of the $-1\mathrm{.}2C$ charge when it is allowed to move assuming the positions of the other two charges remain fixed.