The graph shows the net force \(F_x\) acting on a \(2.0\text{ kg}\) object that moves along the \(x\)-axis as a function of position \(x\). For \(0 \le x \le 3.0\text{ m}\), the force varies quadratically according to \(F_x(x) = cx^2\), reaching a maximum of \(3.0\text{ N}\) at \(x = 3.0\text{ m}\), and for \(3.0\text{ m} \le x \le 7.0\text{ m}\), the force decreases linearly to zero at \(x = 7.0\text{ m}\). If the object has a speed of \(4.0\text{ m/s}\) in the \(+x\)-direction at \(x = 0\), what is the speed of the object when it reaches \(x = 7.0\text{ m}\)?