Two circular pucks on a frictionless, level surface collide off$-$center.$$ Each has a radius of r $=5\mathrm{.}0[$cm$]$ and the only forces exerted in the collision are normal to the edges.$$ Puck $1$ has a mass of $0\mathrm{.}15[$kg$]$ and puck $2$ has a mass of $0\mathrm{.}20[$kg$].$ At the moment of contact, puck $1$ has an initial velocity of $0\mathrm{.}1732[$m$/$s$]$ to the right and puck $2$is at rest. The impact parameter, b $=1\mathrm{.}5$r$.$