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- A power mower does 8 x 104 J of work in 0.4 h. What power does it use?how much work is done when a force of 816.0N is exerted while pushing a crate across a level floor for a distance of 1.40 m ?Find the mass, in kilograms, of an object that requires 6,444 J of work to lift it to a height of 33 meters. Round your answer to the nearest hundredth.