The power expended doing 100 j of work in 50 s is
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When one does twice the work in twice the time, the power expended is _______.
The power expended when a 10 N barbell is raised 2.0 m in 2 s is
A 300 kg piano is being lifted at a steady speed to an apartment 10 m above the ground. The crane lifting the piano takes 50 seconds to lift the piano. What is the average power expended?