A weight lifter lifts a 1000 newton barbell above his head from the floor to a height of 2.5 meters. He holds
the barbell there for 5 seconds. How much work does he do during that 5 second interval?
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work done = mgh
mg = 1000 newton
h = 2.5 m
mgh = 1000 x 2.5
2500 joule
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