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11. Each croquet ball in a set has a mass of 0.53kg. The green ball, traveling at 11.9 m/s,
strikes the blue ball, which is at rest. Assuming that the balls slide on a frictionless
surface and all collisions are head-on, find the final speed of the blue ball if the green
ball continues moving after the collision at 2.5 m/s in the same direction.

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