A jet of water issues from a nozzle with a velocity of 20m/s and it impinges normally on a flat plate moving away from it at 10m/s. If the cross section area of the jet is and the density of water is taken as 1000kg/m3, then the force developed on the plate will be
(A) 100N (B) 200N
(C) 1000N (D) 2000N