see imagine the big block moving bt x distannce so the string of pulley on the lower right side and the string connecting the top left pulley both will move if the small block moves only string of one pulley comes down so if the big block moves a distance x then the small block will move a distance 2x bcoz the string of one pulley will only move
From shadows a light shall spring
Renewed shall be blade that's broken
The crown less again shall be king.
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