Q. 38 The velocity and acceleration of a fluid particle are given as $\vec{V}=(-\hat{\imath}+2 \hat{\jmath}) \mathrm{m} / \mathrm{s}$ and $\vec{a}=(-2 \hat{\imath}-4 \hat{\jmath}) \mathrm{m} / \mathrm{s}^{2}$, respectively. The magnitude of the component of acceleration (in $\mathrm{m} / \mathrm{s}^{2}$, rounded off to two decimal places) of the fluid particle along the streamline is
