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step 1
_ _ _ _
∑ Fy = T cos 37° - w = 0
T = w/cos 37°
T = 40/0,8
T = 50 N
step 2
_ _ _ _
∑ Fx = F - T sin 37° = 0
F = T sin 37°
F = 50 • 0,6
F = 30 N ✔
solusi : A