A 0.015 kg marble moving to the right at 0.225 m / s makes an elastic head-on collision with a 0.030 kg marble moving to the left at 0.180 m / s. After the collision, the smaller marble is moving to the left at 0.315 m / s. Suppose that neither of the marbles rotates before or after the collision and that both marbles are moving on a frictionless surface. What is the velocity of the 0.030-kg marble after the collision?

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