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## Homework Statement

Pelicans tuck their wings and free-fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 18.0m and cannot change its path once committed. If it takes a fish 0.25s to perform evasive action, at what minimum height must it spot the pelican to escape? Assume the fish is at the surface of the water. (Answer must be in 2 significant figures.)

## Homework Equations

X=vot+1/2at^2

## The Attempt at a Solution

I tried to go about solving this but it seems im still getting the wrong answer.

x=vot+1/2at^2

18=(1/2)(9.81)t^2

18=4.9(t)^2

sqrt(3.7)=t^2

t=1.9s

1.9s-.25s=1.65s

x=1/2(9.81)(1.7)^2

x=4.9(1.7)^2

x=14m

x=18m-14m=4m