# 7th physics

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

• 7th physics -

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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