John and Paul Stacks did the same amount of work.
Paul uses the most power.
Work is the product of force and the distance moved by the applied force.
a. Work = force * distance
The unit of force is Joules.
Since John and Paul Stacks the same number of bricks over the same distance, the both did the same amount of work.
b. Power = work done/time taken
The shorter the time taken to do work, the more the applied power.
Since it takes Paul 3 minutes and John 5 minutes, Paul uses the most power.
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