The position vector of a moving body at any instant of time is given as r =(5 t^2 i -5 t j ) m. The magnitude and direction of velocity at t =2 s is,

The position vector of a moving body at any instant of time is given as $\displaystyle \overrightarrow{\mathrm{r}}=\left(5 \mathrm{t}^2 \hat{i}-5 \mathrm{t} \hat{j}\right) \mathrm{m}$. The magnitude and direction of velocity at $\displaystyle \mathrm{t}=2 \mathrm{~s}$ is,