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An empty plastic box of mass 9 kg is fou...

An empty plastic box of mass 9 kg is found to accelerate up at the rate of `g//3` when placed deep inside water. Mass of the sand that should be put inside the box so that it may accelerate down at the rate of `g//4` is :

A

7 kg

B

6 kg

C

9 kg

D

None of these

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The correct Answer is:
A
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