In a pulley setup that has a moving pulley,
a. you have to pull the string a greater distance...
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In a pulley setup that has a moving pulley,
a. you have to pull the string a greater distance, and it takes more work to lift the mass
b. your work doubles because the pulley moves
c. you have to pull the string a greater distance, but the force needed to lift the mass is cut in half
d. you don't have to pull very much to lift the mass
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