Asquare uniform raft, 17 m by 17 m , of mass 7000 kg , is used as a ferry boat. part a if three cars, each of mass 1150 kg , occupy the ne, se, and sw corners, determine the coordinates of the cm of the loaded ferryboat relative to the center of the raft. take the origin to be at the cm of the raft. express your answer using two significant figures. enter your answers numerically separated by a comma.