Each of the two uniform 1.5-kg slender bars is hinged freely at A with its small upper-e...

Each of the two uniform 1.5-kg slender bars is hinged freely at A with its small upper-end guide roller free to move in the horizontal guide. The bars are supported in their 45° equilibrium positions by the vertical spring of stiffness 1050 N/m. If point A is given a very small vertical displacement and then released, calculate the natural frequency of the resulting motion.