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A rock thrown straight up climbs for 4.24 s, then falls to the ground. Neglecting air resistance, with what velocity did the rock strike the ground?

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V = Vo + g*t = 0 @ max ht.
Vo - 9.8*4.24 = 0
Vo = 41.55 m/s. = Initial velocity, up. = Final velocity, down.

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