Velocity ratio of single movable pulley is 2 when Velocity ratio of single fixed pulley is 1. why

Velocity ratio of single pulley = 2

Explanation:

Given:

Tension T

Distance = T + T = 2T

Find:

Velocity ratio of single pulley

Computation:

Velocity ratio of single pulley = Total distance / Distance effort

Velocity ratio of single pulley = 2T / T

Velocity ratio of single pulley = 2

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.