A combination of a movable pulley P1 with a fixed pulley P2 is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.
x/2
As the thread attached to the pulley P1 has to move equally on both the sides of the pulley, therefore if the free end of the string moves a distance of x then the load attached to P1 moves through a distance x2.