Question: An atomic nucleus initially moving at 420 m/s emits an alpha particle in the direction of its velocity and the remaining nucleus slows to 350m/s.

An atomic nucleus initially moving at 420 m/s emits an alpha particle in the direction of its velocity and the remaining nucleus slows to 350m/s. If the alpha particle has a mass of 4.0u and the original nucleus has a mass of 222u, what speed does the alpha particle have when it is emitted?

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