I am taking an online college intro physics course and the instructor does not t

Question

I am taking an online college intro physics course and the instructor does not teach. I am sure he does not know how to teach online. I need examples that example and practice problems. Here is a problem that I don;t get:
A wind farm generator uses a two-bladed propeller mounted on a pylon at a height of 20 m. The length of each propeller blade is 12 m. A tip of the propeller breaks off when the propeller is vertical. The fragment flies off horizontally, falls, and strikes the ground at P. Just before the fragment broke off, the propellor was turning uniformly, taking 1.2 s for each rotation. In the figure, the angle with respect to the vertical at which the fragment strikes the ground is closest to:

Explanation / Answer

angular velocity = 2 / t = 5.23 rad/sec

V = w * r = 62.83 m/sec

S =ut +1/2 gt^2

20 = 1/2 g /t^2

t = 2 sec

V y = Uy+gt = 0 + 9.8 +2 = 19.6m/sec

Vx = 62.83m/sec

angle = tan inverse (19.6/62.83) = 17.32

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