Answer
Scale reading, highest to lowest: A, B=C.
Work Step by Step
Input force multiplied by input distance equals output force multiplied by output distance. In situation A, the output moves 1 m for each 1.0 m of input movement, so the scale reading (same as the tension) equals the crate's weight.
In situations B and C, the output moves 0.5 m for each 1.0 m of input movement, so the scale reading (same as the tension) is half the crate's weight.
This problem may also be analyzed using Newton's second law, and considering the forces on the crate when it is in equilibrium.
