a. How much work must you do to push a kg block of steel across a steel table at a steady speed of m/s for s?
b. What is your power output while doing so?
a). work done is J
b). power output is W
Work done on block is , where we don't know (yet) force or displacement. If we look at force on block, we see that there are two on block: friction and force of push. We can use second law of Newton
Displacement with velocity and elapsed time
So, work required to push the block is
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