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5kg.2m/s+1kg.12m/s= 6kg. v'AB
10kgm/s+12kgm/s = 6kg. v'AB
22 kgm/s=6kg.v'AB
v'AB=22/6 m/s
v'AB=3,6 m/s
Arahnya menuju arah bola A artinya B ke arah A.