Ad. c. motor behaves like a first-order system with a transfer function of relating output position to which it has rotated a load with input signal of 1/s (1 + sτ). if the time constant τ is 1 s and the motor is to be used in a closed-loop control system with unity feedback and a proportional controller, determine the value of the proportionality constant which will give a closed-loop response with a 25% overshoot.