If you doubled the load resistor in a Wheatstone bridge, the load current would not be half as much. Why not?

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.