# After restitution

Classical Mechanics Level 1

Two carts $$A$$ and $$B$$ connected by a compressed spring are moving at a constant speed of $$3$$ 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 $$A$$ and $$B$$ are $$1$$ kg and $$2$$ kg, respectively, and the velocity of $$A$$ after the restitution of the spring is $$1$$ m/s. What is the velocity of $$B$$ 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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