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a)$10.4 \textrm{m/s}$
b)$0.774 \textrm{s}$, $2.90 \textrm{s}$
c)There are two times since it passes the height on the way up, then again on the way down.

Giancoli 6th Edition, Chapter 2, Problem 42

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Chapter 2, Problem 42 is solved.

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