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【General guidance】The answer provided below has been developed in a clear step by step manner.Step1/2The first order transfer function is given:\( \mathrm{{G}{\left({s}\right)}=\frac{{10}}{{{s}+{4}}}{\quad\text{or}\quad}\frac{{2.5}}{{{0.25}{s}+{1}}}} \)Above transfer function compare with, \( \mathrm{\frac{{K}}{{\tau{s}+{1}}}} \)Here, \( \mathrm{\tau} \)is a time constant\( \mathrm{\tau={0.25}{\sec{}}} \)\( \mathrm{{K}} \)is a DC gain or steady state gain\( \mathrm{{K}={2.5}} \)Explanation:Please refer to solution in this step.Step2/2Define the rise time of the unit step response of \( \mathrm{{G}{\left({s}\right)}} \)Where, \( ... See the full answer