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Ditinjau dari benda 2
∑F=m₂*g - T
0=m₂*g - T
T=m₂*g
T=2*10
T=20N
Ditinjau dari benda 1
∑F= T - f
f = T
f = 20N
N*μ=20N ------N=m₁*g=30N
30*μ=20
μ=2/3