A particle has velocity $v= 2\hat r+4 \hat j$ and acceleration $\overrightarrow{a}=0.1 \hat{i}+0.4 \hat j$ Find the speed after 10 seconds

Question

$\begin{array}{1 1} (a) \;\sqrt{27} \\ (b) \;\sqrt{73}\\ (c) \;\sqrt{8} \\ (d) \;\sqrt{12}\end{array}$