A small bob tied at one end of a thin string of length 1 m is describing a vertical circle so that the maximum and minimum tension in the string are…

A small bob tied at one end of a thin string of length $\displaystyle 1$ m is describing a vertical circle so that the maximum and minimum tension in the string are in the ratio $\displaystyle 5$ : 1. The velocity of the bob at the highest position is \_\_\_\_ $\displaystyle \mathrm{m} / \mathrm{s}$. (Take $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )