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Question: A rock thrown with speed 10.5 and launch angle 30.0(above the horizontal) travels a horizontal distance of = 18.0before hitting the ground. From what height was the rock thrown? Use the value = 9.810 for the free-fall acceleration. A rock thrown with speed 10.5 and launch angle 30.0(above the horizontal) travels a horizontal distance of = 18.0before 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. b.)A second rock is thrown straight upward with a speed 5.250 m/s. If this rock takes 1.979 seconds to fall to the ground, from what height was it re leased? Express your answer in meters to three significant figures.

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