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A clay ball with a mass of 0.35 kg has an initial speed of 4.2 m/s...

A clay ball with a mass of 0.35 kg has an initial speed of 4.2 m/s traveling north. It strikes a 1.25 kg clay ball that is traveling towards the other ball at an initial speed of 1.5 m/s. The two ball stick together. What is their final velocity?

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