Question

The pulley has a mechanical advantage of 3. Which statement is true?
a. a user would have to pull the rope 3 times further to lift the block
b. a user would have to do 1/3 the amount of work to lift the block
c. a user would have to use 1/3 of the force to lift the block
d. both a and c are correct

Answer 1

If the first sentence of the question is true, then both a and c are correct. That's (d).

Note: The mechanical advantage of the rig in the picture is actually only 2, but I guess we can't stop to discuss that right now.