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

Learning Goal: To practice Problem-Solving Strategy 4.1 for projectile motion problems. A rock thrown with speed 6.00 m/s and launch angle 30.0 (above the horizontal) travels a horizontal distance of d = 19.0 m before hitting the ground. From what height was the rock thrown? Use the value g = 9.800 m/s' for the free-fall acceleration