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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


Chapter 2, Problem 42 is solved.

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