A pendulum is suspended by a string of length 250 cm. The mass of the bob of the pendulum is 200 g. The bob is pulled aside until the string is at $60^\circ$ with vertical as shown in the figure. After releasing the bob, the maximum velocity attained by the bob will be $\_\_\_\_$ $\mathrm{m\,s^{-1}}$. (if $g = 10\mathrm{~m\,s^{-2}}$)