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A baloon with mass 'm' is descending down with an acceleration 'a' . How much mass should be removed from it so that it so that it starts moving up with an



When balloon is descending                      F is thrust force
                       mg – F = ma                …(i)
          When m′ mass is removed ballon start moving up                                    so
                  F – (m – m′)g = (m – m′)a …(ii)
                  From (i) + (ii)
                  mg – (m – m′)g = ma + (m – m′)a
                  m′g = ma + ma – m′a
                  m′(g + a) = 2ma
0 0 0
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