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Verified answer
Gaya yg bekerja pada balok adalah gaya tegangan tali (T) dan gaya gesek (f) yg arahnya berlawanan.ΣF = m.a
T - f = m.a
T - 0,6 = 0,8 . 0,5
T - 0,6 = 0,4
T = 0,4 + 0,6 = 1 N