A block F is connected by a rigid bar EF to a linkage system at the middle point E of bar BC. The linkage consists of three rigid bars AB, BC, and CD and is pin-supported to the horizontal ground. Bar AB rotates counterclockwise about A with a constant angular velocity WAB . Motion of the block is guided and so it can only move vertically up and down. All connections are pin-connected. Note that AEC is ONE piece of rigid body. Size of the support is ignored. Take = WAB 2rad/s, AB = BE EC = CD=EF=1= 20cm, AD = 21 = 40cm, 0 = 60