What is the tension in each piece of rope in an accelerating balloon system?

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Homework Statement

If the balloon in the diagram drawn below is accelerating upwards at 0.40 m/s (squared), calculate the tension in each piece of rope. Assume that the rope has no mass.

The diagram:

Homework Equations

F = ma

The Attempt at a Solution

For the bottom piece of rope
Fnet = Fa - Fg
Fnet = ma - mg
Fnet = (9.00)(0.40) - (9.00)(9.8)

where Fnet is the tension in the piece of rope, Fa is the force accelerating the balloon upwards, and m is the mass of the object held up by the rope

 

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no help?? I have this problem set due tomorrow.. any answer would be so appreciated