Ah, for your exam, remember: the mechanical advantage is 2, velocity ratio is also 2, and efficiency is less than 100% because of friction and the pulley's weight. My husband, the junior engineer, explained it using my kitchen scale — when I lift a heavy block of chocolate, a movable pulley makes it feel half as heavy, but you still have to pull more rope. So it helps, but nothing in life, or pulleys, comes at full efficiency, no? You always lose a little bit to the way things really are.
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