A balloon is rising vertically up with a velocity of \( 30 \mathrm{~m} / \mathrm{s} \). A stone ...

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A balloon is rising vertically up with a velocity of \( 30 \mathrm{~m} / \mathrm{s} \). A stone is dropped from it reaches the ground in 8 seconds. The height of the balloon when the stone was dropped from it is:
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