A seesaw has an irregularly distributed mass of 40 kg, a length of 3.0 m, and a fulcrum beneath its midpoint. It is balanced when a 60-kg person sits on one end and a 82-kg person sits on the other end.

a) Find the position of the center of mass of the seesaw relative to the fulcrum. Express your answer with the appropriate units. Enter negative value if the center of mass is located closer to the 60- kg person and positive value if the center of mass is located closer to the 82- kg person.

b) Consider a system consisting of a uniform 3.0- m long seesaw that has a mass of 40 kg and two people of masses 60 kg and 82 kg sitting on its ends. Find the position of the center of mass of the system relative to the seesaw's midpoint. Express your answer with the appropriate units. Enter negative value if the center of mass is located closer to the 60- kg person and positive value if the center of mass is located closer to the 82- kg person.