Given that mass m = 25 kg , Normal Force N = 170
NÂ Â
  From Normal Forces F sin θ +N = W
                                     F
sin θ + N = m g
                                F
sin 26 0 + 170 N = 25 kg * 9.8m/s2
                                Fsin
26 0 + 170 NÂ Â = 245 N
                                   Fsin
26 0 = 245 N - 170 N
                                                    =
75 N
                                         F
= 75 N / sin 26
                                               =
75 / 0.438
                                                  =171.08
NÂ Â Â Â Â Â Â Â