Probability — practice question

A particle $P$ of mass $0.6\,\text{kg}$ is let go from rest at a point above ground level and moves vertically downward. The motion of $P$ is resisted by a force of magnitude $3v\,\text{N}$, where $v\,\text{m s}^{-1}$ denotes the speed of $P$. Just before $P$ reaches the ground, $v = 1.95$.