A proton is launched from point 1 in Figure Q21.20 with an initial velocity of \(3.9 \times 10^{5} \mathrm{~m} / \mathrm{s}\). By how much has its kinetic energy changed, in \(\mathrm{eV}\), by the time it passes through point 2 ?

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200 V 100 V OV FIGURE Q21.20 Vo