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An open merry go round rotates at an ang...

An open merry go round rotates at an angular velocity `omega`.A person stands in it at a distance `r` from the rotational axis.It is raining and the rain drops falls vertically at a velocity `v_(0)`.How should the person hold an umbrella to prorect himself from the rain in the best way.Angle made by umbrealla with the vertical is

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