If it takes a fish 0.20s to perform evasive action at, Ask an Expert

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Pelicans tuck their wings and free-fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 20.0 m and cannot change its path once committed.

If it takes a fish 0.20s 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.

Express your answer using two significant figures.

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