A balloon is rising vertically up with a velocity of \(29 \mathrm{~ms}^{-1}\). A stone is dropped from it and it reaches…

A balloon is rising vertically up with a velocity of \(29 \mathrm{~ms}^{-1}\). A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it, was \(\left(g=9.8 \mathrm{~ms}^{-2}\right)\)