A particle of mass \(m\) is constrained to move along the positive \(x\)-axis in a region where its potential energy is given by the function \(U(x) = \dfrac{A}{x^2} - \dfrac{B}{x}\), where \(A\) and \(B\) are positive constants. The particle is released from rest at position \(x = \dfrac{A}{B}\). What is the kinetic energy of the particle when it reaches the position of stable equilibrium?