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A balloon with mass M is descending down...

A balloon with mass M is descending down with an acceleration `a (a lt g)`. What mass of its contents must be removed so that it starts moving up with same acceleration `a`?

A

`(2ma)/(g+a)`

B

`(2ma)/(g-a)`

C

`(ma)/(g+a)`

D

`(ma)/(g-a)`

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