일반물리학 1 — Rotation: Problem 5

5 At time \(t = 0\), a rotating bicycle wheel is thrown horizontally from a rooftop with a speed of \(49 \text{ m/s}\). By the time its vertical speed is also \(49 \text{ m/s}\), it has completed \(40 \text{ revolutions}\). What has been its average angular speed to that point in the fall?