Meriam, Kraige & Bolton — Kinetics of Particles: Problem 3_120

3/120 The particle of mass \( m = 1.2 \text{ kg} \) is attached to the end of the light rigid bar of length \( L = 0.6 \text{ m} \). The system is released from rest while in the horizontal position shown, at which the torsional spring is undeflected. The bar is then observed to rotate \( 30^\circ \) before stopping momentarily. (a) Determine the value of the torsional spring constant \( k_T \). (b) For this value of \( k_T \), determine the speed \( v \) of the particle when \( \theta = 15^\circ \).