Few candidates attempted this question.  Majority of those who attempted it could not apply the correct formula.  Some even mixed up or could not distinguish correctly some of the terms involved e.g. velocity (v) and potential difference (V).  Those that got the formula correct failed due to poor arithmetric.
The expected answer is
 ½ mev2  =   eV                                                                             
v2    =   2eV
              me
=   2x1.6x10-19x 2500
           9.1 x 10-31       
=  8.79 X 1014                                                                                                        
         v =  2.965 x 107 ms-1