A 1.5 m long uniformly dense rigid rod with a mass of 3 kg is suspended from a horizontal surface by a hinge at one end and connected to a vertical surface by a spring with spring constant '10 N/m attached at the other end as shown in the gure When the rod hangs straight down the spring is at its normal length. This pendulum is initially displaced by an angle of10 relative to the vertical and then released from rest. What is the maximum angular velocity (in rad/s) of the pendulum when it is then vertically oriented again? hinge