physics

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A student atands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. The cliff is 50.0 m above flat, horizontal beach. With what speed of impact does the stone land?

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What is the initial KE? What is the initial PE?

FinalKE=intialPE+initialKE

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how does that help mee???

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