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Classical Mechanics Level 3

A balloon with mass m m is descending down with an acceleration a a (where a < g a<g ). How much mass should be removed from it, so that it start moving up with an acceleration a a is:

m a a + g \frac { ma }{ a+g } 2 m a g − a \frac { 2ma }{ g-a } m a g − a \frac { ma }{ g-a } 2 m a a + g \frac { 2ma }{ a+g }

Jaswinder Singh by Jaswinder Singh , 23, India

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