A plate of total mass 13 kg is shaped as indicated in the diagram at right. It is a rectangle of overall dimensions b = 30 cm and c = 50 cm, with identical square notches on the upper and lower left hand corners cut out, where a = 10 cm. Use the lower right hand corner as the origin. A. [5 pts] Determine the vertical coordinate of the center of mass. Show your work or explain your answer. B. [5 pts] Determine the horizontal coordinate of the center of mass. Show your work or explain your