The mechanism consists of 4 members: blocks 1, 4 and wheels 2, 3.
Given: the block 1 is ascending with the speed V1=3m/s. Radiuses of wheels are R2=57cm; r2=36cm; R3=42cm; r3=23cm.
Find: the projection of the velocity of block 4 (in m/s) to vertical axis y directed upwards (considering the projection as positive if the velocity vector is directed upwards and negative if downwards) V4y = ?