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A balloon and its content having mass M is moving up with an acceleration 'a'. The mass that must be released from the content so that the balloon starts moving up with an acceleration '3a' will be : (Take 'g' as acceleration due to gravity)

1. g a 2 Ma 3 −
2. g a 2 Ma 3 +
3. g a 3 Ma 2 +
4. g a 3 Ma 2 −

Correct answer: g a 3 Ma 2 +

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