# Finding Total momentum of a system

1. Jun 13, 2012

### mcordi

1. The problem statement, all variables and given/known data

A 2.2-kg cart is rolling along a frictionless, horizontal track towards a 1.0-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts collide, the first cart's velocity is +4.3 m/s, and the second cart's velocity is -1.1 m/s.*(a)*What is the total momentum of the system of the two carts at this instant?*(b)*What was the velocity of the first cart when the second cart was still at rest?

2. Relevant equations

p=mv

3. The attempt at a solution

So I found the momentums of each individual cart, (p1=9.5N and p2=-1.1N), do I just add the two values for the total momentum of the system? As in: 9.5N + -1.1N = 8.4 N

Thank you

2. Jun 14, 2012

### e^(i Pi)+1=0

edit: nevermind, to find the total momentum yes you just them together

Last edited: Jun 14, 2012
3. Jun 14, 2012

### mcordi

Thank you very much.