A uniform rod of mass m and length L is held at one of its ends such that the other end is vertically above it. Now holding the lower end, we release the rod so that it rotates in a vertical plane. When it reaches the lowermost position, we release the end which has been held in our hands. It is seen that the end which was held in our hands strikes the ground first with rod being vertical at that time. What could be the possible height of the point above the ground where we had held the rod. (Take : ${\pi }^2=10$ & neglect friction)