3 ms·
Because KE is proportional to v^2, and then you get another factor of v since the volume (and thus mass) of air through the rotors per unit time is proportional
by sopooneo 14y ago
Because KE is proportional to v^2, and then you get another factor of v since the volume (and thus mass) of air through the rotors per unit time is proportional to how fast the air is moving.
At least that's my guess. And if I'm right, it's also why, to a first approximation, the power generated by a windmill is proportional to the cube of the wind speed.