Two particles are located in an x$$y coordinate system. Particle $1($mass m$1=10\mathrm{.}0$ kg$)$ is fixed at the origin. Particle $2($mass m$2=20\mathrm{.}0$ kg$)$ is initially located on the x axis $($$=0)$ at distance r$=2\mathrm{.}00$ m from the origin and particle $1.$