kak tolong ini pakai caranya:) cara cara kak:)

W/F = Ik/lb
1.800/F = 150/50
F = 1.800 x 50/150
F = 600 N

W/F = lk/lb
1800/F = 160/40
F = 1.800 x 40/160
F = 450 N

F = 600 - 450 = 150 N
Jawabannya A