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## Homework Statement

a bomb explodes into three pieces of equal mass. two pieces move off at 120 m/s at right angles to each other. how fast is the third mass moving?

## Homework Equations

p = mv

pi = pf

## The Attempt at a Solution

I know how to do most of these questions, it's just that the wording of this particularly one stumps me. How do I know which direction the third mass travels in?

That's what confuses me about this question. Thanks for any clarity that can be offered!