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A balloon with mass 'm' is descending do...

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

A

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

B

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

C

`frac(ma)(g + a)`

D

`frac(ma)(g - a)`

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