1. Three point charges A, B and C each of mass $m$ carry charge $q$, $q$ and $8q$ respectively. They are placed at the vertices of an equilateral triangle of side length $\ell$ as shown in the figure and released from rest. Find the final velocities they will acquire when separation between them becomes very large.
$k = \frac{1}{4\pi\varepsilon_0}$