A square plate of uniform thickness has a side length of 25 cm that hangs vertically from hinges at its top edge, When horizontal jet strikes the plate at its center, the plate is deflected and comes to rest at an angle of 30o to the vertical. The jet is 2.0 cm in diameter and has a velocity of 8.0 m/s. Calculate the mass of the plate. What force should be applied at the lower edge of the plate to maintain its vertical position?