The 1.2-kg uniform slender bar rotates freely about a horizontal axis through O. The sys...

The 1.2-kg uniform slender bar rotates freely about a horizontal axis through O. The system is released from rest when it is in the horizontal position θ = 0 where the spring is unstretched. If the bar is observed to momentarily stop in the position θ = 50° determine the spring constant k. For your computed value of k, what is the angular velocity of the bar when θ = 25°?