no 3 aj tolong dibantu jawabannya

dik : W = 4.000 N ; L = 3 m ; Lb = 0,5 m ; H1 = 1,5 m
dit & jawab :
(a) F = ...???
F = (W x Lb) : Lk = (4.000 x 0,5) : 2,5 = 800 N

(b) KM = ...???
KM = W : F = 4.000 : 800 = 5

(c) U = ...???
U = F x H1 = 800 x 1,5 = 1.200 joule

(d) H2 = ...???
H2 = (F x H1) : W = 1.200 : 4.000 = 0,3 m