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`?

`( ma)/( g + a ) `

`( ma)/( g-a)`

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

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

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