The girl throws a ball 20 m vertically into the air. How long does she have to wait to catch it on the way dow?

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The girl throws a ball 20 m vertically into the air. How long does she have to wait to catch it on the way down? What was its initial velocity? What will be its final velocity?
Tagged with: initial velocity
Filed under: how to get a girl
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I cannot give you the exact answer without knowing the relative humidity and the temperature. Is she @ sea level or above say 3000 meters? Near the equator, or some where above 45 degrees latitude, or below. Is this ball smooth in texture or rough? Does she catch it at her maximum reach or some where near the knees? I am afraid you just have not provided enough info. for a proper calculation. Sorry