An ion’s position vector is initially LaTeX: \vec{r} = 5.0 \hat i - 6.0 \hat j + 2.0 \hat k, r → = 5.0 i ^ − 6.0 j ^ + 2.0 k ^ , and LaTeX: 10\:\text{s}10 s later it is LaTeX: \vec{r} = -2.0 \hat i + 8.0 \hat j - 2.0 \hat k, r → = − 2.0 i ^ + 8.0 j ^ − 2.0 k ^ , all in meters. In unit vector notation, what is its LaTeX: \vec{v}_{avg}v → a v g during the LaTeX: 10\:\text{s}10 s?