NEET 2014 Physics Newton's Laws MCQ Question
A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a?
2ma/g+a
2ma/g-a
ma/g+a
ma/g-a
Correct Answer
Detailed Explanation
The net force required to change the direction of acceleration is 2ma. The mass to be removed is 2ma/(g+a).
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