A positive charge of $5\mathrm{.}50C$ is fixed in place. From a distance of $4\mathrm{.}50cm$ a particle of mass $6\mathrm{.}40g$ and charge $+3\mathrm{.}60C$ is fired with an initial speed of

$72\mathrm{.}0\frac{m}{s}$ directly toward the fixed charge. How close to the fixed charge does the particle get before it comes to rest and starts traveling away?

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