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when toggle format what by license comment
Aug 5, 2021 at 11:22 comment added John Hunter @ Samardeep singh $P=Fv$ comes from $W=Fd$, work done = force x distance, with both sides divided by a small change in time $dt$, when the water is moving slowly, the force on it only moves through a small distance and the work done during that time is low, but when moving faster the distance is greater and the work done for that time interval is greater. So, if it's a constant acceleration, you can use the average distance moved during a small time interval and use the average $v$ in $P=Fv$
Aug 5, 2021 at 10:42 comment added Samardeep singh can you explain it a little, what is the reason behind in taking average velocity
Aug 5, 2021 at 10:32 history answered John Hunter CC BY-SA 4.0