m1v1+m2v2=(m1+m2)v
v=(m1v1+m2v2)/(m1+m2)
v=(54*4,7+62*4,2)/(54+62)=4,43 (м/с)
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m1v1+m2v2=(m1+m2)v
v=(m1v1+m2v2)/(m1+m2)
v=(54*4,7+62*4,2)/(54+62)=4,43 (м/с)