$4\mathrm{.}2\mathrm{.}27.[$Level $2]$ The collar A has a mass of $0\mathrm{.}5$ kg and can slide freely along the illustrated guide wire. The massless

linear spring connecting the collar to $O$ has a spring constant $k=30\frac{N}{m}$ and an unstretched length $L_O=0\mathrm{.}1m.$ If released

from rest at $\frac{?}{\text{b}\text{a}\text{r}}(OA)=0\mathrm{.}7m,$ will the collar reach $B?$ If so$,$ how fast will it be going when it gets there?