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W2 = m.g = 2. 9,8 = 19,6 N
T1 = W1-T = m.a
= 39,2 - T = 4a
= 39,2 - 4a = T1
tanpa gaya gesek jadi bidang licin (k=0)
T2 = W2-T = m.a = 0
= 19,6 - T = 2a = 0
= 19,6 - 2a = T = 0
nilai a = 19,6 / 2 = 9,8 m/s