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To initiate a nuclear reaction, an experimental nuclear physicist Part A wants to shoot a proton info a 5.50−fm-diameter 12C nucleus. The proton must impact the nucleus with a kinetic energy of With what speed must the proton be fired toward the target? 1.40MeV. Assume the nucleus remains at rest. Express your answer with the appropriate units. - Part B Through what potential difference must the proton be accelerated from rest to acquire this speed? Express your answer with the appropriate units.