$+q=1~\mu\mbox{C}$ and $-q=-1~\mu\mbox{C}$ with mass $m=1~\mbox{g}$ are fixed at the positions $\pm \vec{r}_{0}$ with $|r_{0}|=1~\mbox{m}$. The charges are released from rest at $t=0$. Find the time $\tau$ **in seconds** at which they collide.

Hint: Can you do it without integrating by using Kepler's laws?

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