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m1v1+m2v2= (m1+m2)* v3
v3= (m1v1+m2v2): (m1+m2)
v3= (0,5kg*2m/s+ 2kg* 3m/s): (0,5kg+ 2kg)
v3= (1+ 6): 2,5
v3= 2,8m/s