MY ANSWER
a) the work done by the man on the load as he lifted it from the ground to his shoulders if the distance from the ground to the shoulders is 4.0 ft. W = m g h = 50 k g ⋅ 9.8 m s 2 ⋅ 4 f t ⋅ 0.3048 m 1 f t = 597 J . W=mgh=50\ kg\cdot9.
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