two free protons are separated by a distance of 1m. if they are released , the kinetic energy of each proton when at infinite separation is

initial energy = kqq/r =kqq        (as r= 1m)

final energy = kinetic energy + potential energy 

                  = kinetic energy  + 0      (as ptential energy  of system is 0 at infinite distance)

ENERGY CONSERVATION

final kinetic energy of system =  initial potentil energy of system 

                                          =kqq

hence kinetic energy of each proton = kqq/2

q is charge of proton and value of k  is 9 X (10^9) 

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at 1m separation potential energy =E= (1/4pi(epsilon-zero))e², at infinite separation potential energy is zero and the two protons have same kinetic energy, equal to E/2,