Joe, of mass m = 60 kg, jumps vertically upward from the Earth's
          surface with a velocity of v = 1 m/s.
          The Earth, of mass M = 5.98 x 10^(24) kg and
          radius R = 6.37 x 10^6 m, moves imperceptibly downward in response.


    Q:   What will happen to these two objects?


          K  =   (1/2) * 60 kg * (1 m/s)^2   +   0

             =     30 J


                  (6.67 x 10^(-11) N*m^2/kg^2) * (60 kg) * (5.98 x 10^(24) kg)
          U  =  - ------------------------------------------------------------
                                    ( 6.37 x 10^(6) m + 1 m)

             
             =   -3.76 x 10^(9) J



         The virial quantity is


             2 K  +  U   <  0


         and so the two bodies are gravitationally over-bound.
         We can expect Joe to return to the Earth.