A balloon of mass \( M \) is descending with a constant acceleration \( \mathrm{g} / 3 \). When ...

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A balloon of mass \( M \) is descending with a constant acceleration \( \mathrm{g} / 3 \). When a mass \( \mathrm{m} \) is released from the balloon it starts rising with the same acceleration \( \mathrm{g} / 3 \). The value of \( \mathrm{m} \) is (Assuming that its volume does not change) :-
(1) \( \frac{\mathrm{M}}{2} \)
(2) \( \frac{M}{4} \)
(3) \( 4 \mathrm{M} \)
(4) \( 2 \mathrm{M} \)
\( \mathrm{P} \)
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