A man pushes a 50N box across a level floor at a constant speed of 2.0m/s for 10s. Find the average power output by a man.

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To find the average power output by a man, we need to determine the amount of work done and the time taken to do the work.

The work done by the man can be calculated using the formula:

Work = Force x Distance

In this case, the force applied by the man is 50N, and the distance traveled is given by the speed multiplied by the time:

Distance = Speed x Time

So the work done by the man is:

Work = Force x Distance = 50N x (2.0m/s x 10s)

Work = 50N x 20m = 1000 Joules (J)

Now, we can calculate the average power using the formula:

Power = Work / Time

In this case, the work done is 1000 J, and the time taken is 10s. So the average power output by the man is:

Power = 1000J / 10s = 100 Watts (W)

Therefore, the average power output by the man is 100 Watts.