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V_displaced = 15 m^3

m = 13.5 kg

F_net = F_buoyancy - Weight = 44.0 N upwards

a = 3.26 m/s^2 upwards

I'm assuming that winds are calm (i.e. v_wind = 0), and I've not factored in how pressure and density change over altitude.

Again, I feel like a dunderhead for asking this, but using these quantities, how can I calculate range and altitude? All the equations I know involve the use of initial velocity, but the only forces acting on the airship are gravity and the buoyant force.