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A balloon with mass m is descending down...

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

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

B

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

C

`(ma)/(g+a)`

D

`(ma)/(g-a)`

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The correct Answer is:
A
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