Collision of billiard balls

The masses of the blue ball (# 10 10 ) and the purple ball (# 12 12 ) are 2 2 kg and 1 1 kg, respectively. Now, the blue ball with a velocity of 4 4 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 2 2 m/s. What is the velocity of the purple ball after the collision?

2 m/s 1 m/s 4 m/s 6 m/s

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