weightlifter lifts a 70 kg barbell a vertical distance of 1.51 m in a time interval of 2.2 s? (a) What is the weight of the barbell? Use g = 10 m/s2 for gravity.  700 N (b) How much work is required for the weightlifter to lift the barbell vertically above his head a distance of 1.51? 1057 J

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