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DISCUSSION and HINTS
Since the cable does not stretch ( R_dot = 0), an observer on aircraft A will see a circular path for B, although the path of B is more complicated than that. In addition, R_ddot = 0, and since θ_dot = constant, then θ_ddot = 0.
It is recommended that you write down the relative motion kinematics equations relating the motions of A and G:
vB = vA + vB/A
aB = aA + aB/A
and use a set of polar coordinates to describe vB/A and aB/A .