A peregrine falcon dives at a pigeon. The falcon starts downward from rest with free-fall acceleration. If the pigeon is 57.0 m below the initial position of the falcon, how long does the falcon take to reach the pigeon? Assume that the pigeon remains at rest.

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  1. h=gt²/2 =>
    t =sqrt(2h/g)=
    =sqrt(2•57/9.8) =3.41 s

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