Two people are carrying a 2 m long couch with a mass of M=20kg level with the horizontal by lifting it from it ends. The center of mass of the couch is 1 m from each end. While it is being carried, another person with a mass m of 60 kg sits on the couch 0.5 m from one end. How much force will each person carrying the couch have to exert upwards in order to continue carrying the couch levelly?
I don't have a clue on how to start this problem. Does anyone know?
The Attempt at a Solution
Well I know that this is a center of mass problem. I know that Center of mass is equal to sum of each mass times its position all over the total mass of particles.