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v1 x =4 cos 30
=2 akar 3
v2 x=2 cos 60
=1
sigma vx=2akar3-1=1akar3
v1 y=4 sin 30
=2
v2 y=2 sin 60
=1akar3
sigma vy=1akar3-2=1akar3
jadi jawabannya B