Problem a student stands at the edge of a cliff and throws, Ask an Expert

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Problem: A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 15.6 m/s. The cliff is 41.6 m above a flat horizontal beach as shown in the figure.

Part I: What is the angle of impact at landing?

Show how you get the answer, so that I can better understand how to do it.

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