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v1=10 m/s
v2= -20 m/s
v'2=5 m/s
m1=600 kg
m2=400 kg
dit:v'1=..?
m1.v1+m2.v2=m1.v'1+m'2.v'2
600.10+400.-20=600.v'1+400.5
6000-8000=600v'1+2000
-2000=600v'1+2000
600v'1=-2000-2000
600v'1=-4000
v'1=-4000/600
v'1= -6,6 m/s(kiri)