A soccer player kicks a rock horizontally off a cliff 42.9 m high into a pool of water

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A soccer player kicks a rock horizontally off a cliff 42.9 m high into a pool of water

A soccer player kicks a rock horizontally off a cliff 42.9 m high into a pool of water. If the player hears the sound of the splash 3.16 s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
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