A balloon with mass m is descending down with an acceleration a (where 
). How much mass should be removed from it so that it starts moving up with an acceleration ’a’
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let 
be the up thrust of the air. As the balloon is descending down with an acceleration 
mg‐F 
ma (i)
Let mass 
be removed from the balloon so that it starts moving up with an acceleration 
Then,
(ii) Adding eqn. (i) and eqn. (ii), we get
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