\( \therefore \,\,\frac{1}{2}\,\,\left( {\frac{{M{\ell ^2}}}{3}} \right)\,\,\frac{{{V^2}}}{{{R^2}}}\,\, = \,\,mg\,\,\left( {\frac{\ell }{2}} \right)\,\,\therefore \,\,{V^2}\,\, \)
\(= \,\,\frac{{3g}}{\ell } \)
\( \therefore \,\,V\,\, = \,\,\sqrt {\frac{{3g}}{\ell }} \,\,\,\,\,\,\)
\(\therefore \,\,V\,\, = \,\,\sqrt {\frac{{3\,\, \times \,\,9.8}}{1}} \,\,\,\,\,\, \)
\(\therefore \,\,\,V\,\, = \,\,\sqrt {29.\,4} \,\,m/s\)