wo spools of equal mass, a and b, are pulled from rest up identical ramps by inextensible threads with the same tension. the thread is wrapped around spool a many times, but it is attached to a fixed point on spool b, so that spool b will not rotate. there is no friction between the objects and the ramps. both spools are pulled from the bottom of the ramp to the same point at the top of the ramp.