a uniform rod of mass M and length L is made to stand vertically on one and the potential energy of the rod in this position is
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THE POTENTTIAL ENERGY =WORK DONE IN RISING IT FROM HORIZONTAL POSTION TO VERTICAL POSTION.
DOING THIS,THE MID POINT OF THE ROD IS RAISED THROUGH A HEIGHT H=L/2.SINCE THE ENTIRE MASS OF THE ROD CAN BE ASSUMED TO BE CONCENTRATED AT MIDPOINT(CENTER OF GRAVITY),
WD=MGH=MGL/2
THEREFORE
PE=MGL/2
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