Posted by jenny on Thursday, January 5, 2012 at 7:42pm.
It will depend upon whether the balloon is rising or falling when the rock is released.
If the balloon altitude is constant at release of the rock,
Y = (g/2)*t^2
is the distance it falls in time t
g = 32.2 ft/s^2 t = 7 s
Solve for the altitude Y
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