Three children are trying to balance on a seesaw, whichconsists of a fulcrum rock, acting as a pivot at the center,and a very light board 3.6 m long (Fig. 9â50 of text). Twoplaymates are already on either end. Boy A has a mass of50 kg, and girl B a mass of 35 kg. Where should girl C,whose mass is 25 kg, place herself so as to balance theseesaw?