After restitution

Two carts AA and BB connected by a compressed spring are moving at a constant speed of 33 m/s on a frictionless floor as shown above left. At a certain moment, the compression of the spring is released, separating the two carts as shown above right. The masses of AA and BB are 11 kg and 22 kg, respectively, and the velocity of AA after the restitution of the spring is 11 m/s. What is the velocity of BB after the restitution of the spring? (Ignore air resistance and the mass of the spring, and assume the direction of the red arrows is the positive(+) direction.)

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