$$During $8\mathrm{.}53$ s$,$ a motorcyclist changes his velocity from U$1,$x $=-35\mathrm{.}9$ m$/$s and U$1,$y $=13\mathrm{.}1$ m$/$s to U$2,$x $=-$

Uzy $=28\mathrm{.}7$ m$/$s$.$

Find the components of the motorcycle's average acceleration during this process, avx and avy.