Question: John throws a rock from a bridge 12.3 m above water at an initial speed of 15.9 m/s in a direction that is straight

John throws a rock from a bridge 12.3 m above water at an initial speed of 15.9 m/s in a direction that is straight down towards the water below. If we use energy considerations and assume negligible air resistance, with what speed rock will strike the water's surface?

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