A ball is thrown vertically upward from the ground with the initial speed of 50m/s. A tracking radar i located on the ground 600 meters away from where the ball is thrown (see the figure below). The altitude of the ball is given by y(t) = -5t² + 50t at t seconds. Find the speed (velocity) of the angle of elevation, 0, at t = 4. B 600 m

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