### Find the height from which the rock was launched

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##### Reference no: EM13287486

A rock thrown with speed 10.5 and launch angle 30.0(above the horizontal) travels a horizontal distance of = 18.0 before hitting the ground. From what height was the rock thrown? Use the value = 9.810 for the free-fall acceleration.

a.) Find the height (yi) from which the rock was launched. Express your answer in meters to three significant figures.

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