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**1. Homework Statement**

Calculus based so feel free to explain with integrals and such

**2. Homework Equations**

[tex]\vec{p}[/tex]=m[tex]\vec{v}[/tex]

Newton's 3rd law, action reaction forces are internal forces.

**3. The Attempt at a Solution**

I Guess my question is just understand why I got those answers. I'm a little confused on when momentum is conserved (Law of conservation of momentum). Is it only in an isolated system? Where only internal forces react and external forces equal to 0?

And

**if**thats the case, does that mean law of conservation of momentum states that [tex]\Sigma[/tex][tex]\vec{p}[/tex] = 0 ?

So like for example in question B, why would direction matter? Because either way it still collides right?