The graph shows the x-component of an electric field, \(E_x\), as a function of position \(x\) along the x-axis. A small object with charge \(q = -4.0\text{ mC}\) enters the region at \(x = 0\text{ m}\) moving in the \(+x\)-direction with an initial kinetic energy of \(6.0\text{ J}\). Assuming only electrostatic forces act on the object, what is the change in the kinetic energy, \(\Delta K\), of the object as it moves from \(x = 0\text{ m}\) to \(x = 4.0\text{ m}\)?