vc=√((v+v*cos(60))²+(v*sin(60))²)=v*√((1+cos(60))²+(sin(60))²)=v*√(2+2cos(60))=v*√3
v=vc/√3=8.7/√3=5,022.. м/с ~ 5 м/с
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vc=√((v+v*cos(60))²+(v*sin(60))²)=v*√((1+cos(60))²+(sin(60))²)=v*√(2+2cos(60))=v*√3
v=vc/√3=8.7/√3=5,022.. м/с ~ 5 м/с