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ΣF = m.a
W-T1 = 3a
30 - T1 = 3a
30-T1 = a
3
ΣF = m.a
W-T1+T2-fg = m.a
30-T1 + T2 - 20 = 9 (30-T1)
3
10 -T1+T2 = 90 -3T1
2T1 +T2 = 80
3T = 80 ( T1=T2=T)
T= 26,6 ⇔ 27