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OpenStudy (anonymous):
mark weighs375n and is carrying a full sized cello as he climbs as he climbs the stairs at 4m.it takes him 3 seconds to do this .how does the amount of work he does change if he were to climb the same stairs again in the same amout of time.but this time without the cello?A.It decreasesB.It increasesC. it remains the sameD.it depends on the weight of the cello?
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