A particle in an experimental apparatus has a velocity given by $v=k \sqrt{s},$ where $v$ is in millimeters per second, the position $s$ is millimeters, and the constant $k=0.2 \mathrm{mm}^{1 / 2} \mathrm{s}^{-1}$. If the particle has a velocity $v_{0}=3 \mathrm{mm} / \mathrm{s}$ at $t=0,$ determine the particle position, velocity, and acceleration as functions of time, and compute the time, position, and acceleration of the particle when the velocity reaches $15 \mathrm{mm} / \mathrm{s}$