A balloon with mass m is descending down...

A balloon with mass `m` is descending down with an acceleration a `(where altg)` . How much mass should be removed from it so that it starts moving up with an acceleration a?

`(2M(g))/(a)`

`(M(g +a))/(g)`

`(Mg)/(g + a)`

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

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