(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A particle of mass m is moving along the x-axis

with speed v when it collides with a particle of

mass 2m initially at rest. After the collision, the

first particle has come to rest, and the second

particle has split into two equal-mass pieces that

move at equal angles q > 0 with the x-axis.

What is true about the speed of the new particles?

2. Relevant equations

conservation of momentum:

mv = mv

3. The attempt at a solution

According to the answer, each new particle moves with a speed greater than v/2. This seems to violate conservation of momentum to me...but as most people get this question right, I'm probably missing something obvious...

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# Homework Help: Simple momentum question

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