Why is my momentum calculation giving 0.035 kg instead of the expected answer?

[Arcthor]

Homework Statement

The problem is stated here (from brilliant.org)
http://i.imgur.com/MkWwnjT.png

Homework Equations

momentum = mass * velocity

The Attempt at a Solution

My attempt at a solution can be found here:
http://i.imgur.com/Zsco86W.jpg

I get the answer 0.035kg, but that is not an option. What am I doing wrong?

 

[Nathanael]

Momentum is a vector. Only the eastern component of m₂'s momentum is equal to the momentum of the piece that went due west.

 

[Arcthor]

Momentum is a vector. Only the eastern component of m₂'s momentum is equal to the momentum of the piece that went due west.

Oh god this is embarassing, how could I miss that. Haha well thank you :)