Specify where the line of action of the resultant force intersects a horizontal line along member CB, measured from end C. Express your answer to three significant figures and include the appropriate units. Enter positive value if the line of action intersects a horizontal line CB to the right from end CC and negative value if the line of action intersects a horizontal line CB to the left from end C.

Attached is the question and the solution

current flows in a wire

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.