Question

what should be the speed of wind to make the wind mill move?

Answer 1

In general, wind speeds are as follows: 8 kph (2 m/s) minimum is required to start rotating most small wind turbines. 12.6 kph (3.5 m/s) is the typical cut-in speed when a small turbine starts generating power. 36–54 kph (10–15 m/s) produces maximum generation power.

Answer 2

15 -20 kilometer per hour..
Hope this helps u out..