m1v1 + m2v2 = (m1+m2)v'
karena B diam, maka v2 = 0, maka m2v2 = 0
m1v1 = (m1 + m2)v'
mv = (m + 3m)v'
mv = 4mv'
v' = 1/4 v
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m1v1 + m2v2 = (m1+m2)v'
karena B diam, maka v2 = 0, maka m2v2 = 0
m1v1 = (m1 + m2)v'
mv = (m + 3m)v'
mv = 4mv'
v' = 1/4 v