Four point masses are placede at four corners of a square of side 4m as shown. Match the following columns.
`{:("Column1","Column2"),("A x-coordinate of center of mass of 4kg and 2kg","P (7//2)m"),("B x-coordinates of center of mass of 4kg 2kg and 3kg","Q (4//3)m"),("C y-coordinate of center of mass of 1kg 4kg and 3kg","R 3m"),("y-coordinate of center of mass of 1kg and 3kg","(20/9)m"):}`