A balloon with mass M is descending down with an acceleration a (a < g). What mass m be detached from it, so that it starts moving up with an acceleration a.
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A balloon with mass M is descending down with an acceleration a (a < g). What mass m be detached from it, so that it starts moving up with an acceleration a.
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Trick
The buoyant force always acts up as the environment does not change
Explanation:
For the balloon coming down
Mg - F =Ma
For the balloon going up
F - (M-m)g = (M-m)a
Solving
m = 2Mg /g+a