In Figure 5-52, 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 = 30.0 kg, mB = 42.0 kg, and mC = 14.0 kg. When the assembly is released from rest, (a) what is the tension in the cord connecting B and C, and (b) how far does A move in the first 0.260 s (assuming it does not reach the pulley)?
... there is block a which is on the surface and block b and c are hanging over the edge pulling it down.
fnet = ma
T = ma
Fgc - T = ma
Fgb - T = ma
The Attempt at a Solution
I'm not sure what i'm supposed to do, i thought of subtracting the equations, but i don't think that will work based on what i'm looking at and i dont think substitution of a variable t or a will work... help?