A proton is shot at 5.0 x 10 7 m/s toward a gold target. The nucleus of

Question:

A proton is shot at 5.0 x 10⁷ m/s toward a gold target. The nucleus of a gold atom, with a mass 197 times that of the pro- ton, repels the proton and deflects it straight back with 90% of its initial speed. What is the recoil speed of the gold nucleus?

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