A reel of thread unrolls itself falling down under gravity. Neglecting mass of the thread, the a...

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A reel of thread unrolls itself falling down under gravity. Neglecting mass of the thread, the acceleration of the reel is
(a) \( g \)
(b) \( \mathrm{g} / 2 \)
(c) \( 2 \mathrm{~g} / 3 \)
(d) \( 4 g / 3 \)
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