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When you throw a ball straight up, it slows down until it comes to a stop...

When you throw a ball straight up, it slows down until it comes to a stop at its greatest height and then accelerates downward. The time it takes for a ball thrown upward to reach a height, , is given by
.
The initial velocity needed to get it to that height is given by
How long will a ball be in the air on Earth that you throw to a height of 6.525 m?
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