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m2=6kg
a=W2-W1/m1+m2
a=6x10-4x10/4+6
a=60-40/10
a=20/10
a=2m/s2
b)tegangan tali pertama Ta=?
m1=4kg
tegangan didapat dari rumus sigma F
∈F=m*a
~W-T=m*a
masukkan
Wa-Ta=ma*a
4x10-Ta=4*2
40-Ta=8
Ta=40-8
Ta=32N