posted by jenny .
baloonist drops rock from balloon. takes 7 seconds for the rock to fall. what's the balloonist's altitude in feet?
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