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An empty plastic box of mass m is found ...

An empty plastic box of mass m is found to accelerate up at the rate of g/6 when placed deep inside water. How much sand should be put inside the box so that it may accelerate down at the rate of g/6?

A

`2M//5`

B

`M//5`

C

`2M//3`

D

`6M//7`

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The correct Answer is:
a
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