calculus

A stone dropped from a ballon which was rising at the rate of 15 ft./sec. reached the ground in 8 seconds. how high was the ballon when the stone was dropped?
please help :-) thank you

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  1. h = Vo*t + 0.5g*t^2 = -15*8 + 16*8^2 =
    -120 + 1024 = 904 Ft.

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