An engineering student is dropping an egg from the top of a

An engineering student is dropping an egg from the top of a building that is 40 feet high. How long will it take the egg to hit the ground?

Solution

Formula:
h(t) = -16t^2 + 40
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h(t) is the height of the object at time=t.
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The height is zero when the egg hits the ground.
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-16t^2+40 = 0
-16t^2 = -40
t^2 = 40/16 = 5/2
t = sqrt(5/2) seconds (time for the egg to reach the ground)