ex is the prefix, pend is the root word, and ed is the suffix. A
hint is to look up ex in the dictionary, then pend, then ed. if you
can find all of these, then make them equal the definition of
expended to the pre/sufix. It has both! :D
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It means the same as spent. Money which is expended is spent. A
battery which is expended is spent; it has been used up.
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The power during the lift is (weight of the barbell in Newtons)/4.4 watts.
Note:
Power is not "expended". Energy is. Power is the rate at which energy is expended.