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General
Easy
Question
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 collisions, the first particle has come to rest, and the second particle has split into two equal-mass pieces that move at equal angles 
> 0 with the x-axis, as shown in the figure. Which of the following statements correctly describes the speeds of the two pieces?
- Each piece moves with speed v
- One of the pieces moves with speed v, the other moves with speed less than v
- Each piece moves with speed v/2
- Each piece moves with speed greater than v/2
The correct answer is: Each piece moves with speed greater than v/2
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