Two teams of nine members each engage in a tug of war. Each of the first team's members has an average mass of 61.0 kg and exerts an average force of 1.34 10 N horizontally. Each of the second team's members has an average mass of 78.5 kg and exerts an average force of 1.39 x 103 N horizontally. (Assume both teams and the rope accelerate as a single body.)