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Answer:The answer is 271.3 joules .Explanation: Work = (weight) x (distance) Work = (50 lb) x (1 kg / 2.20462 lb) x (9.81 newton/kg) x (4 feet) x (1 meter / 3.28084 feet) = (50 x 9.81 x 4) / (2.20462 x 3.28084) newton-meter = 271.3 joules . We don't need to know how long the lift took, unless we want to know how much power he was able to deliver. Power = (work) / (time) = (271.3 joule) / (5 sec) = 54.3 watts . ________________________________________ The easy way: Work = (weight) x (distance) = (50 pounds) x (4 feet) = 200 foot-pounds Look up (online) how many joules there are in 1 foot-pound. There are 1.356 joules in 1 foot-pound. So 200 foot-pounds = (200 x 1.356) = 271.2 joules. credits original answer AL2006
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