Consider the following picture, where the same platform and man is being lifted by a crane and by the man standing the platform, who can pull on a rope connected to a pulley in the ceiling. My question is: Does the scenario in which the man has the pulley have a mechanical advantage over the other? i.e. Does he have to supply half the force over twice the length to lift the platform? If yes, how can I realize that he must pull twice the amount of rope through the pulley?