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axwe7

axwe7

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How much work is done by a weight-lifter (1.6 m tall) lifting 250 kg from
the ground to 0.45 m above his head??
 
porcupinetree

porcupinetree

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W = Fs = mg*h = 250kg * 9.8 ms^-2 * (1.6+0.45) = 5.0 x 10^3 J (2 sig. fig.)
 
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