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.
Part A: Find the height yi from which the rock was launched.
I need help to find the height yi from which the rock was launched.