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Σ⊤ = 0
pakai Σ⊤ A = 0
W • ½ • AB - T • cos θ • AB = 0
W • ½ • AB = T • cos θ • AB
T = (W • ½ • AB) / (cos θ • AB)
T = W • ½ / cos θ
T = W • ½ / cos θ
Ingat bahwa 1/cos = sec. sehingga :
T = W • ½/ cos θ
T = ½ W sec θ
Jadi, tegangan tali T sebesar ½ W sec θ (Jawaban D)