In Figure 5-50, three ballot boxes are connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. The masses are mA = 28.0 kg, mB = 40.0 kg, mC = 22.0 kg. Box A is on the table and B/C are hanging from the table from the pulley system. So B/C would be on the vertical (a) When the assembly is released from rest, what is the tension in the cord that connects boxes B and C? F=ma I'm not really sure where to start for finding the tension between the 2 boxes. Any hints to get me started would be nice, thanks.