Since the Power is directly proportional to the velocity, their ratio 
is constant.
<span>Therefore </span>
which is a proportion:
500 : 1000 = x : 1728
that can be easily solved:
x = (500×1728)/1000 = 864kW
<span>Therefore </span>
500 : 1000 = x : 1728
that can be easily solved:
x = (500×1728)/1000 = 864kW