Collision of billiard balls

The masses of the blue ball (#1010) and the purple ball (#1212) are 22 kg and 11 kg, respectively. Now, the blue ball with a velocity of 44 m/s collides with the purple ball which was standing still. After the collision, the blue ball keeps moving in the same direction with a reduced velocity of 22 m/s. What is the velocity of the purple ball after the collision?

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