When a tangential force of 0.02 N is applied on a large wooden plate of area $10m^2$ floating on the surface of the river, plate moves with the speed of 2 m/s on the river surface. If the river is 1 m deep and the water in contact with the bed is stationary, The coefficient of viscosity of water is

• A

  $2\times {10}^{-2}\mathrm{poise}$

• B

  ${10}^{-2}\mathrm{poise}$

• C

  ${10}^{-4}\mathrm{poise}$

• D

  $2\times {10}^{-1}\mathrm{poise}$