Question: A one tenth scale model of a plane that will fly in air (density 1.2 kg m -3 , viscosity Pas) at 100m s -1

A one tenth scale model of a plane that will fly in air (density 1.2 kg m^-3, viscosity Pas) at 100m s^-1 is to be tested in water (density 1000 kg m^-3, viscosity Pas) . How fast should the water go to keep the Reynolds number the same as for air?

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