Momentum of 3 Balls: Ball 1 & Triangle

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In a scenario with three balls, where balls 2 and 3 are stationary, ball 1 collides with ball 2 and stops, transferring momentum to ball 2, which then hits ball 3. Ball 2 moves at a 30-degree angle to the left, while ball 3 moves at a 60-degree angle to the right. The combined vectors of their movements can be represented as a right triangle, with the hypotenuse representing the initial momentum of the system. The initial momentum is indeed solely attributed to ball 1 since the other two balls were stationary before the collision. This analysis illustrates the conservation of momentum in a multi-body collision scenario.
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I'm just wondering: in the case when there is 3 balls and ball 2 and ball 3 is stationary. Ball 1 hits ball 2 then stops and ball 2 hits ball 3. Ball 2 moves at an angle of let's say 30 degrees to the left and ball 3 moves at an angles of 60 degrees to the right. You then combine the vectors to form a right triangle. The hypotenuse is the momentum of the 3 balls initially. Would the hypotenuse just be the momentum of ball 1since the rest are stationary?
 
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