A pendulum of length \( 2 \, \text{m} \) consists of a wooden bob of mass \( 50 \, \text{g} \). A bullet of mass \( 75 \, \text{g} \) is fired towards the stationary bob with a speed \( v \). The bullet emerges out of the bob with a speed \( \dfrac{v}{3} \) and the bob just completes the vertical circle. The value of \( v \) is ______ \( \text{m s}^{-1} \). (if \( g = 10 \, \text{m} / \text{s}^{2} \) ).
