SOLUTION: the height "h" of a rock, "t" seconds after it is dropped off a cliff is given by the equation: h=-16t(squared)+256. How many seconds after the rock is dropped will it hit the grou

Question 774213: the height "h" of a rock, "t" seconds after it is dropped off a cliff is given by the equation: h=-16t(squared)+256. How many seconds after the rock is dropped will it hit the ground?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

You know it is being dropped from a cliff
that is ft high, because at
,
----------------------
The term tells you what
gravity is doing to the rock as the
seconds go by
----------------------
It will hit the ground when , so

In 4 seconds the rock will hit the ground
Here's what the plot looks like:

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