Physics F=MA problem

This is just a part of my physics lab,
A pulley, Mass A = 1.0 kg; Mass B = 5.0 kg.
What is the total mass, total force and calculated acceleration?

I tried doing it:
Total Mass = 6.0 kg
Total force = 39.24 N
Acceleration = 6.54 m/s^2

I don't think this is right?

I assume that you have a pulley with a cord over it, with mass A on one side and mass B on the other. The masses begin at a standstill and you then let them go, and you're to calculate how quickly the masses accelerate, with one going up, the other going down.

Right? If so, you're doing this correctly.

There is a greater downward force on the larger mass, and the difference between the forces on the masses will be what drives the acceleration. But that force difference has to accelerate the entire system.

So yes, those should all be correct.

String tension T = 2*M*m/(M+m) = 16.33 N
a = [Mg - T]/M = 6.533 m/s²

Fnet = ΣM*a = 39.2 N