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 is starts moving up with an acceleration 'a'?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
mg – F = ma .....
F – (m – m') g = (m – m') a
from
F – mg + m ′ g = ma – m ′ a
mg – ma – mg + m ′ g = ma – m ′ a
m ′ (g + a) = 2ma
m ′ = 
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