A particle with mass m moving at speed v collides with a particle with mass 2m initially at rest. After the collision, the two particles have velocities that are directed at equal angles of θ on either side of the original line of motion of the m particle. What is the speed v' of the 2m particle after the collision?
1. v' = v/4sinθ
2. v' = v/cosθ
3. v' = vsinθ/4
4. v' = v/4cosθ
5. v' = vcosθ
6. v' = v/2cosθ
7. v' = vsinθ/2
8. v' = v/sinθ
9. v' = vcosθ4
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