Block A has a mass of 3.0 kg and a velocity of 13.0 m/s, catching up a second block B that has a mass of 3.0kg and is moving with 5m/s in the same direction. They suffer an elastic collision and the second block is now moving with 8m/s. What is the speed of the first block after the collision? 5 m/s 8 m/s 18 m/s 10 m/s 13 m/s

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