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Find the useful power output (in W) of an elevator motor that lifts a 2800 kg load a height of 40.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of the counterbalanced system is 10,000 kg-so that only 2800 kg is raised in height, but the full 10,000 kg is accelerated. (Enter a number.)
Sagot :
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