Question a rock thrown with speed 120ms and launch angle, Ask an Expert

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Question: A rock thrown with speed 12.0m/s and launch angle 30.0 degrees (above the horizontal) travels a horizontal distance of d = 15.5m before hitting the ground. From what height was the rock thrown? Use the value g = 9.810m/s2 for the free-fall acceleration.

A) Find the height yi from which the rock was launched.

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