\(\eqalign{ & F = 50N;P = mg = 3.9,8 = 29,4(N); \cr & N = Pcos\beta = 29,4.{{\sqrt 3 } \over 2} \approx 25,5(N) \cr & {A_F} = F.S = 50.1,5 = 75J;{A_N} = 0 \cr & {A_P} = P.S.cos\alpha = P.S.\cos ({90^0} + \beta ) \cr & = P.S.\cos ({90^0} +30^0 ) \cr&= 29,4.1,5.\left( -{{1 \over 2}} \right) \approx -22,1(N) \cr} \)