If cabin is descending in vertical direction with acceleration \( a \) and reaction by mass \( M...

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If cabin is descending in vertical direction with acceleration \( a \) and reaction by mass \( M \) on the floor of cabin is \( \frac{9 M g}{10} \), then \( a \) equals to
(a) \( g \)
(b) \( \frac{g}{10} \)
(c) \( \frac{9}{10} \mathrm{~g} \)
(d) \( \frac{10}{9} g \)
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