F=2ma   and    F-N=ma(n is force acting                          and  N=ma

                                 on rope at other end)                   so F=2N

at mid point f rope                                                      

 

F-N'=ma\2    and        N'--N=ma\2

  so

      F--N'=N--N'    SO  F+N=2N'

 

                          N'=F+N\2    so  N'=F+F\2

                                                       -------

                                                          2

                                                                      SO   N'=0.75  IS AWNSER