\( \vec{v}=2 t^{7 / 2} \hat{\imath}-\frac{4}{2} t^{5 / 2} \hat{\jmath}+\frac{4}{5}t^1/2 hat{j} \) \( t=1 / 3 sec . \)

Question

\( \vec{v}=2 t^{7 / 2} \hat{\imath}-\frac{4}{2} t^{5 / 2} \hat{\jmath}+\frac{4}{5}+1 / 2 \hat{j} \) \( t=1 / 3 sec . \)