The minimum uncertainty in the speed of an electron in an one dimensional region of length $2 \mathrm{a}_{\mathrm{o}}$ (Where $\mathrm{a}_{\mathrm{o}}=$ Bohr radius $52.9 \,\mathrm{pm}$) is _________ $\mathrm{km} \,\mathrm{s}^{-1}$.

(Given : Mass of electron = 9.1 $\times$ 10^$-$31 kg, Planck's constant h = 6.63 $\times$ 10^$-$34 Js)