A balloon with mass \( m \) is descending down with an acceleration \( a \) (where \( ag \) ). H...

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A balloon with mass \( m \) is descending down with an acceleration \( a \) (where \( ag \) ). How much mass should be removed from it, so that it starts moving up with an acceleration \( a \) ?
(a) \( \frac{2 m a}{g+a} \)
(b) \( \frac{2 m a}{g-a} \)
(c) \( \frac{m a}{g+a} \)
(d) \( \frac{m a}{g-a} \)
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