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A ball is thrown to the sky directly from the edge of the skyscraper which has...

A ball is thrown to the sky directly from the edge of the skyscraper which has 58.1 meters lenght. Asssume that the ball does not hit the skyscraper when it returns from sky journey to the ground and hit the ground 4.0 seconds after it was thrown. Find the velocity of the ball when it was thrown (initial velocity)?

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