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## Homework Statement

Consider a system consisting of three particles:

m1=5kg, v1=

m2=7kg, v2=

m3=1kg, v3=

What is the total momentum of this system?

What is the velocity of the center of mass of this system?[/B]

## Homework Equations

p=m*v

## The Attempt at a Solution

**I tried (m1+m2)(v1+v2) + (m2+m3)(v2+v3)**

and (m1+m2+m3)(v1+v2+v3), neither were correct...

and (m1+m2+m3)(v1+v2+v3), neither were correct...