A man is on a bosun chair attached to a frictionless massless pulley and is holding onto the other end of a rope. (at ground level) a. What is the force he must pull himself up at if he is to move at a constant speed? Is the set up T + T = mg? b. If instead the rope is held by someone else, what is the force needed to pull him up at a constant speed? And is this set up as T = mg? c. What is the force exerted by the ceiling on the system for both cases? This one I am lost on since I need to do a free body diagram for each case. I dont understand why there is such a difference, in essence.