We are given the following information
Length of the windmill blade = 6 m
Angular velocity of the windmill = 0.20 rad/s
We are asked to find the linear velocity of the tip of the blade.
The linear velocity of the tip of the blade is given by

Where ω is the angular velocity of the windmill and L is the length of the blade.
Substituting the given values into the above formula, we get

Therefore, the linear velocity of the tip of the blade is 1.2 m/s