Question: A proton (mass 1 u) is shot toward an unknown target nucleus at a speed of 2.50 10 6 m/s. The proton rebounds with

A proton (mass 1 u) is shot toward an unknown target nucleus at a speed of 2.50 × 10⁶ m/s. The proton rebounds with its speed reduced by 25% while the target nucleus acquires a speed of 3.12 × 10⁵ m/s. What is the mass, in atomic mass units, of the target nucleus?

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