Box 1 is sitting at rest. Box 2 is moving to the left when it collides elastically with Box 1 (see figure). The surface is frictionless. Take the right to be the positive x-direction. The mass of Box 1 is 4.00 kg. The mass of Box 2 is 7.00 kg. The speed of Box 2 is 1.40 m/s before the collision. The speed of Box 1 is 2.00 m/s after the collision. What is the velocity of Box 2 after the collision?

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