Q:  What is the gravitational potential energy of the double star now?

                         G * m_A * m_B
             GPE  =  -  ---------------
                               a


                         G * [ 2 * 1.99 x 10^(30) kg ] * [ 1.99 x 10^(30) kg ]
                  =  -  ------------------------------------------------------
                                 1.39 x 10^(10) m


                  =  - 3.8 x 10^(40) J



  Q:  What is the kinetic energy of the companion star?


              KE  =  (1/2) * m_B * ( v_B )^2

                   
                  =   0.5 * (1.99 x 10^(30) kg) * ( 3.55 x 10^5 m/s )^2


                  =   1.3 x 10^(41) J



  Q:  What is the total energy of the system?

             
               KE + GPE  >  0       even without the KE of the exploded star