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v2=m1*v1/m2
v2=50kg*7m/s /40kg
v2=8.3 m/s
m=40kg
m=50kg+40kg=90kg
V=7m/s
p₁+p₂=p₃
p₃(m₁+m₂)•V₃
V₃=m₁•V₁/m₁+m₂
V₃=50kg•7m/s
50kg+40kg=3.5,m/s