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V1=2 m/s
V2=4 m/s
m1=2 kg
m2=3 kg
dit: v'=..?
v'=m1.v1+m2.v2/m1+m2
v'=2.2+3.4/2+3
v'=4+12/5
v'=16/5
v'=3,2 m/s